[1] : 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 

[2] : WordNet (r) 2.0

civil day
     n : a day reckoned from midnight to midnight syn: calendar day
see also:
calendar day 

Civil >> C Words
Civil, definition of term: Civil
civil_pag1.html

Civil Engineer >> C Words
Civil Engineer, definition of term: Civil Engineer
civil+engineer_pag1.html

Civil Disobedie >> C Words
Civil Disobedie, definition of term: Civil Disobedie
civil+disobedie_pag1.html

Civil Defense >> C Words
Civil Defense, definition of term: Civil Defense
civil+defense_pag1.html

Civil Engineeri >> C Words
Civil Engineeri, definition of term: Civil Engineeri
civil+engineeri_pag1.html

Civil Law >> C Words
Civil Law, definition of term: Civil Law
civil+law_pag1.html

Civil Right >> C Words
Civil Right, definition of term: Civil Right
civil+right_pag1.html

Civil Marriage >> C Words
Civil Marriage, definition of term: Civil Marriage
civil+marriage_pag1.html

Civil Liberty >> C Words
Civil Liberty, definition of term: Civil Liberty
civil+liberty_pag1.html

Civil Death >> C Words
Civil Death, definition of term: Civil Death
civil+death_pag1.html

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