From The Collaborative International Dictionary of English v.0.48 [gcide]:
Prime \Prime\, a. [F., fr. L. primus first, a superl.
corresponding to the compar. prior former. See {Prior}, a.,
{Foremost}, {Former}, and cf. {Prim}, a., {Primary},
{Prince}.]
1. First in order of time; original; primeval; primitive;
primary. "Prime forests." --Tennyson.
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She was not the prime cause, but I myself. --Milton.
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Note: In this sense the word is nearly superseded by
primitive, except in the phrase prime cost.
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2. First in rank, degree, dignity, authority, or importance;
as, prime minister. "Prime virtues." --Dryden.
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3. First in excellence; of highest quality; as, prime wheat;
a prime quality of cloth.
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4. Early; blooming; being in the first stage. [Poetic]
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His starry helm, unbuckled, showed him prime
In manhood where youth ended. --Milton.
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5. Lecherous; lustful; lewd. [Obs.] --Shak.
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6. Marked or distinguished by a mark (') called a prime mark.
Note: In this dictionary the same typographic mark is used to
indicate a weak accent in headwords, and minutes of a
degree in angle measurements.
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7. (Math.)
(a) Divisible by no number except itself or unity; as, 7
is a prime number.
(b) Having no common factor; -- used with to; as, 12 is
prime to 25.
[Webster 1913 Suppl.]
{Prime and ultimate ratio}. (Math.). See {Ultimate}.
{Prime conductor}. (Elec.) See under {Conductor}.
{Prime factor} (Arith.), a factor which is a prime number.
{Prime figure} (Geom.), a figure which can not be divided
into any other figure more simple than itself, as a
triangle, a pyramid, etc.
{Prime meridian} (Astron.), the meridian from which longitude
is reckoned, as the meridian of Greenwich or Washington.
{Prime minister}, the responsible head of a ministry or
executive government; applied particularly to that of
England.
{Prime mover}. (Mech.)
(a) A natural agency applied by man to the production of
power. Especially: Muscular force; the weight and
motion of fluids, as water and air; heat obtained by
chemical combination, and applied to produce changes
in the volume and pressure of steam, air, or other
fluids; and electricity, obtained by chemical action,
and applied to produce alternation of magnetic force.
(b) An engine, or machine, the object of which is to
receive and modify force and motion as supplied by
some natural source, and apply them to drive other
machines; as a water wheel, a water-pressure engine, a
steam engine, a hot-air engine, etc.
(c) Fig.: The original or the most effective force in any
undertaking or work; as, Clarkson was the prime mover
in English antislavery agitation.
{Prime number} (Arith.), a number which is exactly divisible
by no number except itself or unity, as 5, 7, 11.
{Prime vertical} (Astron.), the vertical circle which passes
through the east and west points of the horizon.
{Prime-vertical dial}, a dial in which the shadow is
projected on the plane of the prime vertical.
{Prime-vertical transit instrument}, a transit instrument the
telescope of which revolves in the plane of the prime
vertical, -- used for observing the transit of stars over
this circle.
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From The Collaborative International Dictionary of English v.0.48 [gcide]:
Meridian \Me*rid"i*an\, n. [F. m['e]ridien. See {Meridian}, a.]
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1. Midday; noon.
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2. Hence: The highest point, as of success, prosperity, or
the like; culmination.
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I have touched the highest point of all my
greatness,
And from that full meridian of my glory
I haste now to my setting. --Shak.
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3. (Astron.) A great circle of the sphere passing through the
poles of the heavens and the zenith of a given place. It
is crossed by the sun at midday.
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4. (Geog.) A great circle on the surface of the earth,
passing through the poles and any given place; also, the
half of such a circle included between the poles.
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Note: The planes of the geographical and astronomical
meridians coincide. Meridians, on a map or globe, are
lines drawn at certain intervals due north and south,
or in the direction of the poles.
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{Calculated for the meridian of}, or {fitted to the meridian
of}, or {adapted to the meridian of}, suited to the local
circumstances, capabilities, or special requirements of.
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All other knowledge merely serves the concerns of
this life, and is fitted to the meridian thereof.
--Sir M. Hale.
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{First meridian} or {prime meridian}, the meridian from which
longitudes are reckoned. The meridian of Greenwich is the
one commonly employed in calculations of longitude by
geographers, and in actual practice, although in various
countries other and different meridians, chiefly those
which pass through the capitals of the countries, are
occasionally used; as, in France, the meridian of Paris;
in the United States, the meridian of Washington, etc.
{Guide meridian} (Public Land Survey), a line, marked by
monuments, running North and South through a section of
country between other more carefully established meridians
called principal meridians, used for reference in
surveying. [U.S.]
{Magnetic meridian}, a great circle, passing through the
zenith and coinciding in direction with the magnetic
needle, or a line on the earth's surface having the same
direction.
{Meridian circle} (Astron.), an instrument consisting of a
telescope attached to a large graduated circle and so
mounted that the telescope revolves like the transit
instrument in a meridian plane. By it the right ascension
and the declination of a star may be measured in a single
observation.
{Meridian instrument} (Astron.), any astronomical instrument
having a telescope that rotates in a meridian plane.
{Meridian of a globe}, or {Brass meridian}, a graduated
circular ring of brass, in which the artificial globe is
suspended and revolves.
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From WordNet (r) 3.0 (2006) [wn]:
prime meridian
n 1: meridian at zero degree longitude from which east and west
are reckoned (usually the Greenwich longitude in England)
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