Found 2 items, similar to mean time.
English → English (WordNet) Definition: mean time mean time n : (astronomy) time based on the motion of the mean sun (an imaginary sun moving uniformly along the celestial equator) [syn: mean solar time]
English → English (gcide) Definition: Mean time Mean \Mean\, a. [OE. mene, OF. meiien, F. moyen, fr. L. medianus that is in the middle, fr. medius; akin to E. mid. See Mid.] 1. Occupying a middle position; middle; being about midway between extremes. [1913 Webster] Being of middle age and a mean stature. --Sir. P. Sidney. [1913 Webster] 2. Intermediate in excellence of any kind. [1913 Webster] According to the fittest style of lofty, mean, or lowly. --Milton. [1913 Webster] 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. [1913 Webster] 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 noon. 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. [1913 Webster] Time \Time\, n.; pl. Times. [OE. time, AS. t[=i]ma, akin to t[=i]d time, and to Icel. t[=i]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. [1913 Webster] The time wasteth [i. e. passes away] night and day. --Chaucer. [1913 Webster] I know of no ideas . . . that have a better claim to be accounted simple and original than those of space and time. --Reid. [1913 Webster] 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. [1913 Webster] God, who at sundry times and in divers manners spake in time past unto the fathers by the prophets. --Heb. i. 1. [1913 Webster] 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. [1913 Webster] 4. The duration of one's life; the hours and days which a person has at his disposal. [1913 Webster] Believe me, your time is not your own; it belongs to God, to religion, to mankind. --Buckminster. [1913 Webster] 5. A proper time; a season; an opportunity. [1913 Webster] There is . . . a time to every purpose. --Eccl. iii. 1. [1913 Webster] The time of figs was not yet. --Mark xi. 13. [1913 Webster] 6. Hour of travail, delivery, or parturition. [1913 Webster] She was within one month of her time. --Clarendon. [1913 Webster] 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. [1913 Webster] Summers three times eight save one. --Milton. [1913 Webster] 8. The present life; existence in this world as contrasted with immortal life; definite, as contrasted with infinite, duration. [1913 Webster] Till time and sin together cease. --Keble. [1913 Webster] 9. (Gram.) Tense. [1913 Webster] 10. (Mus.) The measured duration of sounds; measure; tempo; rate of movement; rhythmical division; as, common or triple time; the musician keeps good time. [1913 Webster] Some few lines set unto a solemn time. --Beau. & Fl. [1913 Webster] 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. [1913 Webster] 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 next. 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 midnight. 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 strength. 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; greeting. 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. [1913 Webster]