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

unit \u"nit\, n. abbrev. from unity.
   1. a single thing or person.
      1913 webster

   2. arith. the least whole number; one.
      1913 webster

            units are the integral parts of any large number.
                                                  --i. watts.
      1913 webster

   3. a gold coin of the reign of james i., of the value of
      twenty shillings. --camden.
      1913 webster

   4. any determinate amount or quantity as of length, time,
      heat, value adopted as a standard of measurement for
      other amounts or quantities of the same kind.
      1913 webster

   5. math. a single thing, as a magnitude or number, regarded
      as an undivided whole.
      1913 webster

   abstract unit, the unit of numeration; one taken in the
      abstract; the number represented by 1. the term is used in
      distinction from concrete, or determinate, unit, that is,
      a unit in which the kind of thing is expressed; a unit of
      measure or value; as 1 foot, 1 dollar, 1 pound, and the
      like.

   complex unit theory of numbers, an imaginary number of
      the form a + broot-1, when a^2 + b^2 = 1.

   duodecimal unit, a unit in the scale of numbers increasing
      or decreasing by twelves.

   fractional unit, the unit of a fraction; the reciprocal of
      the denominator; thus, 1/4 is the unit of the fraction
      3/4.

   integral unit, the unit of integral numbers, or 1.

   physical unit, a value or magnitude conventionally adopted
      as a unit or standard in physical measurements. the
      various physical units are usually based on given units of
      length, mass, and time, and on the density or other
      properties of some substance, for example, water. see
      dyne, erg, farad, ohm, poundal, etc.

   unit deme biol., a unit of the inferior order or orders
      of individuality.

   unit jar elec., a small, insulated leyden jar, placed
      between the electrical machine and a larger jar or
      battery, so as to announce, by its repeated discharges,
      the amount of electricity passed into the larger jar.

   unit of heat physics, a determinate quantity of heat
      adopted as a unit of measure; a thermal unit see under
      thermal. water is the substance generally employed, the
      unit being one gram or one pound, and the temperature
      interval one degree of the centigrade or fahrenheit scale.
      when referred to the gram, it is called the gram degree.
      the british unit of heat, or thermal unit, used by
      engineers in england and in the united states, is the
      quantity of heat necessary to raise one pound of pure
      water at and near its temperature of greatest density
      39.1deg fahr. through one degree of the fahrenheit
      scale. --rankine.

   unit of illumination, the light of a sperm candle burning
      120 grains per hour. standard gas, burning at the rate of
      five cubic feet per hour, must have an illuminating power
      equal to that of fourteen such candles.

   unit of measure as of length, surface, volume, dry
      measure, liquid measure, money, weight, time, and the
      like, in general, a determinate quantity or magnitude of
      the kind designated, taken as a standard of comparison for
      others of the same kind, in assigning to them numerical
      values, as 1 foot, 1 yard, 1 mile, 1 square foot, 1 square
      yard, 1 cubic foot, 1 peck, 1 bushel, 1 gallon, 1 cent, 1
      ounce, 1 pound, 1 hour, and the like; more specifically,
      the fundamental unit adopted in any system of weights,
      measures, or money, by which its several denominations are
      regulated, and which is itself defined by comparison with
      some known magnitude, either natural or empirical, as, in
      the united states, the dollar for money, the pound
      avoirdupois for weight, the yard for length, the gallon of
      8.3389 pounds avoirdupois of water at 39.8deg fahr.
      about 231 cubic inches for liquid measure, etc.; in
      great britain, the pound sterling, the pound troy, the
      yard, or 1/108719 part of the length of a second's
      pendulum at london, the gallon of 277.274 cubic inches,
      etc.; in the metric system, the meter, the liter, the
      gram, etc.

   unit of power. mach. see horse power.

   unit of resistance. elec. see resistance, n., 4, and
      ohm.

   unit of work physics, the amount of work done by a unit
      force acting through a unit distance, or the amount
      required to lift a unit weight through a unit distance
      against gravitation. see erg, foot pound,
      kilogrammeter.

   unit stress mech. physics, stress per unit of area;
      intensity of stress. it is expressed in ounces, pounds,
      tons, etc., per square inch, square foot, or square yard,
      etc., or in atmospheres, or inches of mercury or water, or
      the like.
      1913 webster
see also:
abstract unit complex unit -1 2 duodecimal unit fractional unit 
integral unit physical unit dyne erg farad 
ohm poundal unit deme unit jar unit of heat 
thermal unit of illumination unit of measure unit of power horse power 
unit of resistance resistance unit of work foot pound kilogrammeter 
unit stress 

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

heat \heat\ h=et, n. oe. hete, haete, as. h=aetu,
   h=aeto, fr. h=at hot; akin to ohg. heizi heat, dan. hede,
   sw. hetta. see hot.
   1. a force in nature which is recognized in various effects,
      but especially in the phenomena of fusion and evaporation,
      and which, as manifested in fire, the sun's rays,
      mechanical action, chemical combination, etc., becomes
      directly known to us through the sense of feeling. in its
      nature heat is a mode of motion, being in general a form
      of molecular disturbance or vibration. it was formerly
      supposed to be a subtile, imponderable fluid, to which was
      given the name caloric.
      1913 webster

   note: as affecting the human body, heat produces different
         sensations, which are called by different names, as
         heat or sensible heat, warmth, cold, etc., according to
         its degree or amount relatively to the normal
         temperature of the body.
         1913 webster

   2. the sensation caused by the force or influence of heat
      when excessive, or above that which is normal to the human
      body; the bodily feeling experienced on exposure to fire,
      the sun's rays, etc.; the reverse of cold.
      1913 webster

   3. high temperature, as distinguished from low temperature,
      or cold; as, the heat of summer and the cold of winter;
      heat of the skin or body in fever, etc.
      1913 webster

            else how had the world . . .
            avoided pinching cold and scorching heat --milton.
      1913 webster

   4. indication of high temperature; appearance, condition, or
      color of a body, as indicating its temperature; redness;
      high color; flush; degree of temperature to which
      something is heated, as indicated by appearance,
      condition, or otherwise.
      1913 webster

            it has raised . . . heats in their faces. --addison.
      1913 webster

            the heats smiths take of their iron are a blood-red
            heat, a white-flame heat, and a sparkling or welding
            heat.                                 --moxon.
      1913 webster

   5. a single complete operation of heating, as at a forge or
      in a furnace; as, to make a horseshoe in a certain number
      of heats.
      1913 webster

   6. a violent action unintermitted; a single effort; a single
      course in a race that consists of two or more courses; as,
      he won two heats out of three.
      1913 webster

            many causes . . . for refreshment betwixt the heats.
                                                  --dryden.
      1913 webster

            he struck off at one heat the matchless tale of
            "tam o' shanter."                     --j. c.
                                                  shairp.
      1913 webster

   7. utmost violence; rage; vehemence; as, the heat of battle
      or party. "the heat of their division." --shak.
      1913 webster

   8. agitation of mind; inflammation or excitement;
      exasperation. "the heat and hurry of his rage." --south.
      1913 webster

   9. animation, as in discourse; ardor; fervency; as, in the
      heat of argument.
      1913 webster

            with all the strength and heat of eloquence.
                                                  --addison.
      1913 webster

   10. zool. sexual excitement in animals; readiness for
       sexual activity; estrus or rut.
       1913 webster +pjc

   11. fermentation.
       1913 webster

   12. strong psychological pressure, as in a police
       investigation; as, when they turned up the heat, he took
       it on the lam. slang
       pjc

   animal heat, blood heat, capacity for heat, etc. see
      under animal, blood, etc.

   atomic heat chem., the product obtained by multiplying
      the atomic weight of any element by its specific heat. the
      atomic heat of all solid elements is nearly a constant,
      the mean value being 6.4.

   dynamical theory of heat, that theory of heat which assumes
      it to be, not a peculiar kind of matter, but a peculiar
      motion of the ultimate particles of matter.

   heat engine, any apparatus by which a heated substance, as
      a heated fluid, is made to perform work by giving motion
      to mechanism, as a hot-air engine, or a steam engine.

   heat producers. physiol. see under food.

   heat rays, a term formerly applied to the rays near the red
      end of the spectrum, whether within or beyond the visible
      spectrum.

   heat weight mech., the product of any quantity of heat by
      the mechanical equivalent of heat divided by the absolute
      temperature; -- called also thermodynamic function, and
      entropy.

   mechanical equivalent of heat. see under equivalent.

   specific heat of a substance at any temperature, the
      number of units of heat required to raise the temperature
      of a unit mass of the substance at that temperature one
      degree.

   unit of heat, the quantity of heat required to raise, by
      one degree, the temperature of a unit mass of water,
      initially at a certain standard temperature. the
      temperature usually employed is that of 0deg centigrade,
      or 32deg fahrenheit.
      1913 webster
see also:
hot caloric cold animal heat blood heat capacity for heat 
animal blood atomic heat dynamical theory of heat heat engine 
heat producers food heat rays heat weight thermodynamic function 
entropy mechanical equivalent of heat equivalent specific heat of a substance at any temperature unit of heat 

Control Unit >> C Words
Control Unit, definition of term: Control Unit
control+unit_pag1.html

Angstrom Unit >> A Words
Angstrom Unit, definition of term: Angstrom Unit
angstrom+unit_pag1.html