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3 definitions found
 for Mean time
From The Collaborative International Dictionary of English v.0.48 :

  Mean \Mean\, a. [OE. mene, OF. meiien, F. moyen, fr. L. medianus
     that is in the middle, fr. medius; akin to E. mid. See
     1. Occupying a middle position; middle; being about midway
        between extremes.
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              Being of middle age and a mean stature. --Sir. P.
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     2. Intermediate in excellence of any kind.
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              According to the fittest style of lofty, mean, or
              lowly.                                --Milton.
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     3. (Math.) Average; having an intermediate value between two
        extremes, or between the several successive values of a
        variable quantity during one cycle of variation; as, mean
        distance; mean motion; mean solar day.
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     Mean distance (of a planet from the sun) (Astron.), the
        average of the distances throughout one revolution of the
        planet, equivalent to the semi-major axis of the orbit.
     Mean error (Math. Phys.), the average error of a number of
        observations found by taking the mean value of the
        positive and negative errors without regard to sign.
     Mean-square error, or Error of the mean square (Math.
        Phys.), the error the square of which is the mean of the
        squares of all the errors; -- called also, mean square
        deviation, mean error.
     Mean line. (Crystallog.) Same as Bisectrix.
     Mean noon, noon as determined by mean time.
     Mean proportional (between two numbers) (Math.), the square
        root of their product.
     Mean sun, a fictitious sun supposed to move uniformly in
        the equator so as to be on the meridian each day at mean
     Mean time, time as measured by an equable motion, as of a
        perfect clock, or as reckoned on the supposition that all
        the days of the year are of a mean or uniform length, in
        contradistinction from apparent time, or that actually
        indicated by the sun, and from sidereal time, or that
        measured by the stars.
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From The Collaborative International Dictionary of English v.0.48 :

  Time \Time\, n.; pl. Times. [OE. time, AS. t[imac]ma, akin to
     t[imac]d time, and to Icel. t[imac]mi, Dan. time an hour, Sw.
     timme. [root]58. See Tide, n.]
     1. Duration, considered independently of any system of
        measurement or any employment of terms which designate
        limited portions thereof.
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              The time wasteth [i. e. passes away] night and day.
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              I know of no ideas . . . that have a better claim to
              be accounted simple and original than those of space
              and time.                             --Reid.
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     2. A particular period or part of duration, whether past,
        present, or future; a point or portion of duration; as,
        the time was, or has been; the time is, or will be.
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              God, who at sundry times and in divers manners spake
              in time past unto the fathers by the prophets.
                                                    --Heb. i. 1.
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     3. The period at which any definite event occurred, or person
        lived; age; period; era; as, the Spanish Armada was
        destroyed in the time of Queen Elizabeth; -- often in the
        plural; as, ancient times; modern times.
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     4. The duration of one's life; the hours and days which a
        person has at his disposal.
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              Believe me, your time is not your own; it belongs to
              God, to religion, to mankind.         --Buckminster.
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     5. A proper time; a season; an opportunity.
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              There is . . . a time to every purpose. --Eccl. iii.
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              The time of figs was not yet.         --Mark xi. 13.
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     6. Hour of travail, delivery, or parturition.
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              She was within one month of her time. --Clarendon.
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     7. Performance or occurrence of an action or event,
        considered with reference to repetition; addition of a
        number to itself; repetition; as, to double cloth four
        times; four times four, or sixteen.
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              Summers three times eight save one.   --Milton.
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     8. The present life; existence in this world as contrasted
        with immortal life; definite, as contrasted with infinite,
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              Till time and sin together cease.     --Keble.
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     9. (Gram.) Tense.
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     10. (Mus.) The measured duration of sounds; measure; tempo;
         rate of movement; rhythmical division; as, common or
         triple time; the musician keeps good time.
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               Some few lines set unto a solemn time. --Beau. &
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     Note: Time is often used in the formation of compounds,
           mostly self-explaining; as, time-battered,
           time-beguiling, time-consecrated, time-consuming,
           time-enduring, time-killing, time-sanctioned,
           time-scorner, time-wasting, time-worn, etc.
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     Absolute time, time irrespective of local standards or
        epochs; as, all spectators see a lunar eclipse at the same
        instant of absolute time.
     Apparent time, the time of day reckoned by the sun, or so
        that 12 o'clock at the place is the instant of the transit
        of the sun's center over the meridian.
     Astronomical time, mean solar time reckoned by counting the
        hours continuously up to twenty-four from one noon to the
     At times, at distinct intervals of duration; now and then;
        as, at times he reads, at other times he rides.
     Civil time, time as reckoned for the purposes of common
        life in distinct periods, as years, months, days, hours,
        etc., the latter, among most modern nations, being divided
        into two series of twelve each, and reckoned, the first
        series from midnight to noon, the second, from noon to
     Common time (Mil.), the ordinary time of marching, in which
        ninety steps, each twenty-eight inches in length, are
        taken in one minute.
     Equation of time. See under Equation, n.
     In time.
         (a) In good season; sufficiently early; as, he arrived in
             time to see the exhibition.
         (b) After a considerable space of duration; eventually;
             finally; as, you will in time recover your health and
     Mean time. See under 4th Mean.
     Quick time (Mil.), time of marching, in which one hundred
        and twenty steps, each thirty inches in length, are taken
        in one minute.
     Sidereal time. See under Sidereal.
     Standard time, the civil time that has been established by
        law or by general usage over a region or country. In
        England the standard time is Greenwich mean solar time. In
        the United States and Canada four kinds of standard time
        have been adopted by the railroads and accepted by the
        people, viz., Eastern, Central, Mountain, and Pacific
        time, corresponding severally to the mean local times of
        the 75th, 90th, 105th, and 120th meridians west from
        Greenwich, and being therefore five, six, seven, and eight
        hours slower than Greenwich time.
     Time ball, a ball arranged to drop from the summit of a
        pole, to indicate true midday time, as at Greenwich
        Observatory, England. --Nichol.
     Time bargain (Com.), a contract made for the sale or
        purchase of merchandise, or of stock in the public funds,
        at a certain time in the future.
     Time bill. Same as Time-table. [Eng.]
     Time book, a book in which is kept a record of the time
        persons have worked.
     Time detector, a timepiece provided with a device for
        registering and indicating the exact time when a watchman
        visits certain stations in his beat.
     Time enough, in season; early enough. "Stanly at Bosworth
        field, . . . came time enough to save his life." --Bacon.
     Time fuse, a fuse, as for an explosive projectile, which
        can be so arranged as to ignite the charge at a certain
        definite interval after being itself ignited.
     Time immemorial, or Time out of mind. (Eng. Law) See
        under Immemorial.
     Time lock, a lock having clockwork attached, which, when
        wound up, prevents the bolt from being withdrawn when
        locked, until a certain interval of time has elapsed.
     Time of day, salutation appropriate to the times of the
        day, as "good morning," "good evening," and the like;
     To kill time. See under Kill, v. t.
     To make time.
         (a) To gain time.
         (b) To occupy or use (a certain) time in doing something;
             as, the trotting horse made fast time.
     To move against time, To run against time, or To go
     against time, to move, run, or go a given distance without a
        competitor, in the quickest possible time; or, to
        accomplish the greatest distance which can be passed over
        in a given time; as, the horse is to run against time.
     True time.
         (a) Mean time as kept by a clock going uniformly.
         (b) (Astron.) Apparent time as reckoned from the transit
             of the sun's center over the meridian.
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From WordNet (r) 3.0 (2006) :

  mean time
      n 1: (astronomy) time based on the motion of the mean sun (an
           imaginary sun moving uniformly along the celestial equator)
           [syn: mean time, mean solar time]

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