[1] : The Collaborative International Dictionary of English v.0.48

sidereal \side"real\, a. l. sidereus, from sidus, sideris, a
   constellation, a star. cf. sideral, consider, desire.
   1. relating to the stars; starry; astral; as, sidereal
      astronomy.
      1913 webster

   2. astron. measuring by the apparent motion of the stars;
      designated, marked out, or accompanied, by a return to the
      same position in respect to the stars; as, the sidereal
      revolution of a planet; a sidereal day.
      1913 webster

   sidereal clock, day, month, year. see under clock,
      day, etc.

   sideral time, time as reckoned by sideral days, or, taking
      the sidereal day as the unit, the time elapsed since a
      transit of the vernal equinox, reckoned in parts of a
      sidereal day. this is, strictly, apparent sidereal time,
      mean sidereal time being reckoned from the transit, not of
      the true, but of the mean, equinoctial point.
      1913 webster
see also:
sideral consider desire sidereal clock day month 
year clock day sideral time 

[2] : The Collaborative International Dictionary of English v.0.48

day \day\ d=a, n. oe. day, dai, dei, as. daeg; akin to
   os., d., dan.,  sw. dag, g. tag, icel. dagr, goth. dags; cf.
   skr. dah for dhagh ? to burn. root69. cf. dawn.
   1. the time of light, or interval between one night and the
      next; the time between sunrise and sunset, or from dawn to
      darkness; hence, the light; sunshine; -- also called
      daytime.
      1913 webster +pjc

   2. the period of the earth's revolution on its axis. --
      ordinarily divided into twenty-four hours. it is measured
      by the interval between two successive transits of a
      celestial body over the same meridian, and takes a
      specific name from that of the body. thus, if this is the
      sun, the day the interval between two successive transits
      of the sun's center over the same meridian is called a
      solar day; if it is a star, a sidereal day; if it is
      the moon, a lunar day. see civil day, sidereal day,
      below.
      1913 webster

   3. those hours, or the daily recurring period, allotted by
      usage or law for work.
      1913 webster

   4. a specified time or period; time, considered with
      reference to the existence or prominence of a person or
      thing; age; time.
      1913 webster

            a man who was great among the hellenes of his day.
                                                  --jowett
                                                  thucyd. 
      1913 webster

            if my debtors do not keep their day, . . .
            i must with patience all the terms attend. --dryden.
      1913 webster

   5. preceded by the some day in particular, as some day of
      contest, some anniversary, etc.
      1913 webster

            the field of agincourt,
            fought on the day of crispin crispianus. --shak.
      1913 webster

            his name struck fear, his conduct won the day.
                                                  --roscommon.
      1913 webster

   note: day is much used in self-explaining compounds; as,
         daybreak, daylight, workday, etc.
         1913 webster

   anniversary day. see anniversary, n.

   astronomical day, a period equal to the mean solar day, but
      beginning at noon instead of at midnight, its twenty-four
      hours being numbered from 1 to 24; also, the sidereal day,
      as that most used by astronomers.

   born days. see under born.

   canicular days. see dog day.

   civil day, the mean solar day, used in the ordinary
      reckoning of time, and among most modern nations beginning
      at mean midnight; its hours are usually numbered in two
      series, each from 1 to 12. this is the period recognized
      by courts as constituting a day. the babylonians and
      hindoos began their day at sunrise, the athenians and jews
      at sunset, the ancient egyptians and romans at midnight.
      

   day blindness. med. see nyctalopia.

   day by day, or day after day, daily; every day;
      continually; without intermission of a day. see under
      by. "day by day we magnify thee." --book of common
      prayer.

   days in bank eng. law, certain stated days for the return
      of writs and the appearance of parties; -- so called
      because originally peculiar to the court of common bench,
      or bench bank as it was formerly termed. --burrill.

   day in court, a day for the appearance of parties in a
      suit.

   days of devotion r. c. ch., certain festivals on which
      devotion leads the faithful to attend mass. --shipley.

   days of grace. see grace.

   days of obligation r. c. ch., festival days when it is
      obligatory on the faithful to attend mass. --shipley.

   day owl, zool., an owl that flies by day. see hawk owl.
      

   day rule eng. law, an order of court now abolished
      allowing a prisoner, under certain circumstances, to go
      beyond the prison limits for a single day.

   day school, one which the pupils attend only in daytime, in
      distinction from a boarding school.

   day sight. med. see hemeralopia.

   day's work naut., the account or reckoning of a ship's
      course for twenty-four hours, from noon to noon.

   from day to day, as time passes; in the course of time; as,
      he improves from day to day.

   jewish day, the time between sunset and sunset.

   mean solar day astron., the mean or average of all the
      apparent solar days of the year.

   one day, one of these days, at an uncertain time, usually
      of the future, rarely of the past; sooner or later. "well,
      niece, i hope to see you one day fitted with a husband."
      --shak.

   only from day to day, without certainty of continuance;
      temporarily. --bacon.

   sidereal day, the interval between two successive transits
      of the first point of aries over the same meridian. the
      sidereal day is 23 h. 56 m. 4.09 s. of mean solar time.

   to win the day, to gain the victory, to be successful. --s.
      butler.

   week day, any day of the week except sunday; a working day.
      

   working day.
      a a day when work may be legally done, in distinction
          from sundays and legal holidays.
      b the number of hours, determined by law or custom,
          during which a workman, hired at a stated price per
          day, must work to be entitled to a day's pay.
          1913 webster
see also:
dawn daytime solar day sidereal day lunar day civil day 
sidereal day anniversary day anniversary astronomical day born days 
born canicular days dog day day blindness nyctalopia 
day by day day after day by days in bank day in court 
days of devotion days of grace grace days of obligation day owl 
hawk owl day rule day school day sight hemeralopia 
day's work from day to day jewish day mean solar day one day 
one of these days only from day to day to win the day week day working day 

[3] : WordNet (r) 2.0

day
     n 1: time for earth to make a complete rotation on its axis; "two
          days later they left"; "they put on two performances
          every day"; "there are 30,000 passengers per day" syn:
          twenty-four hours, solar day, mean solar day
     2: some point or period in time; "it should arrive any day
        now"; "after that day she never trusted him again"; "those
        were the days"; "these days it is not unusual"
     3: the time after sunrise and before sunset while it is light
        outside; "the dawn turned night into day"; "it is easier
        to make the repairs in the daytime" syn: daytime, daylight
        ant: night
     4: a day assigned to a particular purpose or observance;
        "mother's day"
     5: the recurring hours when you are not sleeping especially
        those when you are working; "my day began early this
        morning"; "it was a busy day on the stock exchange"; "she
        called it a day and went to bed"
     6: an era of existence or influence; "in the day of the
        dinosaurs"; "in the days of the roman empire"; "in the
        days of sailing ships"; "he was a successful pianist in
        his day"
     7: a period of opportunity; "he deserves his day in court";
        "every dog has his day"
     8: the period of time taken by a particular planet e.g. mars
        to make a complete rotation on its axis; "how long is a
        day on jupiter?"
     9: the time for one complete rotation of the earth relative to
        a particular star, about 4 minutes shorter than a mean
        solar day syn: sidereal day
     10: united states writer best known for his autobiographical
         works 1874-1935 syn: clarence day, clarence shepard
         day jr.
see also:
twenty-four hours solar day mean solar day daytime daylight night 
sidereal day clarence day clarence shepard day jr. 

[4] : Moby Thesaurus II by Grady Ward, 1.0

108 moby thesaurus words for "day":
   international date line, platonic year, abundant year,
   academic year, aeon, age, annum, annus magnus, antedate,
   bissextile year, broad day, calendar month, calendar year, century,
   common year, cycle, cycle of indiction, date, date line, datemark,
   dawn, day glow, daylight, dayshine, daytide, daytime, decade,
   decennary, decennium, defective year, dusk, epoch, era,
   fateful moment, fiscal year, fortnight, full sun, generation,
   great year, green flash, heyday, hour, indiction, instant,
   interval, juncture, kairos, leap year, lifetime, light,
   light of day, lunar month, lunar year, lunation, luster, lustrum,
   man-hour, microsecond, midday sun, millennium, millisecond, minute,
   moment, moment of truth, month, moon, noonlight, noontide light,
   period, point, point of time, postdate, pregnant moment, prime,
   psychological moment, quarter, quinquennium, ray of sunshine,
   regular year, season, second, semester, session, shine,
   sidereal year, solar year, space, span, spell, stage, stretch, sun,
   sun spark, sunbeam, sunbreak, sunburst, sunlight, sunshine, term,
   time, time lag, trimester, twelvemonth, twilight, week, weekday,
   while, year

[5] : Easton's 1897 Bible Dictionary

day
   the jews reckoned the day from sunset to sunset lev. 23:32. it
   was originally divided into three parts ps. 55:17. "the heat
   of the day" 1 sam. 11:11; neh. 7:3 was at our nine o'clock,
   and "the cool of the day" just before sunset gen. 3:8. before
   the captivity the jews divided the night into three watches, 1
   from sunset to midnight lam. 2:19; 2 from midnight till the
   cock-crowing judg. 7:19; and 3 from the cock-crowing till
   sunrise ex. 14:24. in the new testament the division of the
   greeks and romans into four watches was adopted mark 13:35.
   see watches.
   
     the division of the day by hours is first mentioned in dan.
   3:6, 15; 4:19; 5:5. this mode of reckoning was borrowed from the
   chaldeans. the reckoning of twelve hours was from sunrise to
   sunset, and accordingly the hours were of variable length john
   11:9.
   
     the word "day" sometimes signifies an indefinite time gen.
   2:4; isa. 22:5; heb. 3:8, etc.. in job 3:1 it denotes a
   birthday, and in isa. 2:12, acts 17:31, and 2 tim. 1:18, the
   great day of final judgment.
   
see also:
watches 

[6] : Bouvier's Law Dictionary, Revised 6th Ed (1856)

day. a division of time. it is natural, and then it consists of twenty-four 
hours, or the space of time which elapses while the earth makes a complete 
revolution on its axis; or artificial, which contains the time, from the 
rising until the setting of the sun, and a short time before rising and 
after setting. vide night; and co. lit. 135, a. 
     2. days are sometimes calculated exclusively, as when an act required 
that an appeal should be made within twenty days after a decision. 3 penna. 
200; 3 b.  a. 581; 15 serg.  rawle, 43. in general, if a thing is to be 
done within such a time after such a fact, the day of the fact shall be 
taken inclusively. hob. 139; doug. 463;  3 t. r. 623; com. dig. temps, a; 3 
east, 407. 
     3. the law, generally, rejects fractions of days, but in some cases it 
takes notice of such parts. 2 b.  a. 586. vide date. 
     4. by the custom of some places, the word day's is understood to be 
working days, and not including sundays. 3 espin. n. p. c. 121. vide, 
generally, 2 chit. bl. 141, note 3; 1 chit. pr. 774, 775; 3 chit. pr. 110; 
lill. reg. h. t; 1 rop. leg. 518; 15 vin. ab. 554; dig. 33, 1, 2; dig. 50, 
16, 2, 1; id. 2, 12, 8; and articles hour; month; year. 

[7] : THE DEVIL'S DICTIONARY ((C)1911 Released April 15 1993)

day, n.  a period of twenty-four hours, mostly misspent.  this period
is divided into two parts, the day proper and the night, or day
improper -- the former devoted to sins of business, the latter
consecrated to the other sort.  these two kinds of social activity
overlap.

[8] : U.S. Gazetteer (1990)

day, fl
  zip codes: 32013

[9] : U.S. Gazetteer Counties (2000)

day -- u.s. county in south dakota
   population 2000:    6267
   housing units 2000: 3618
   land area 2000:     1028.574329 sq. miles 2663.995168 sq. km
   water area 2000:    62.634335 sq. miles 162.222176 sq. km
   total area 2000:    1091.208664 sq. miles 2826.217344 sq. km
   located within:       south dakota sd, fips 46
   location:             45.373992 n, 97.572474 w
   headwords:
    day
    day, sd
    day county
    day county, sd

Day >> D Words
Day, definition of term: Day
day_pag1.html

Day Care >> D Words
Day Care, definition of term: Day Care
day+care_pag1.html

Day Off >> D Words
Day Off, definition of term: Day Off
day+off_pag1.html

Columbus Day >> C Words
Columbus Day, definition of term: Columbus Day
columbus+day_pag1.html

Christmas Day >> C Words
Christmas Day, definition of term: Christmas Day
christmas+day_pag1.html

Boxing Day >> B Words
Boxing Day, definition of term: Boxing Day
boxing+day_pag1.html

Arbor Day >> A Words
Arbor Day, definition of term: Arbor Day
arbor+day_pag1.html

Bastille Day >> B Words
Bastille Day, definition of term: Bastille Day
bastille+day_pag1.html

Armistice Day >> A Words
Armistice Day, definition of term: Armistice Day
armistice+day_pag1.html

Bissextile Day >> B Words
Bissextile Day, definition of term: Bissextile Day
bissextile+day_pag1.html

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