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Perpetuation :: Perpetuation (n.) The act of making perpetual, or of preserving from extinction through an endless existence, or for an indefinite period of time; continuance..

Chronometry :: Chronometry (n.) The art of measuring time; the measuring of time by periods or divisions.

Archaeolithic :: Archaeolithic (a.) Of or pertaining to the earliest Stone age; -- applied to a prehistoric period preceding the Paleolithic age.

Week :: Week (n.) A period of seven days, usually that reckoned from one Sabbath or Sunday to the next..

Saturn :: Saturn (n.) One of the planets of the solar system, next in magnitude to Jupiter, but more remote from the sun. Its diameter is seventy thousand miles, its mean distance from the sun nearly eight hundred and eighty millions of miles, and its year, or periodical revolution round the sun, nearly twenty-nine years and a half. It is surrounded by a remarkable system of rings, and has eight satellites..

Quarter :: Quarter (n.) The fourth part of the moon's period, or monthly revolution; as, the first quarter after the change or full..

Olympiad :: Olympiad (n.) A period of four years, by which the ancient Greeks reckoned time, being the interval from one celebration of the Olympic games to another, beginning with the victory of Cor/bus in the foot race, which took place in the year 776 b.c.; as, the era of the olympiads..

Faluns :: Faluns (n.) A series of strata, of the Middle Tertiary period, of France, abounding in shells, and used by Lyell as the type of his Miocene subdivision..

Anatropous :: Anatropous (a.) Having the ovule inverted at an early period in its development, so that the chalaza is as the apparent apex; -- opposed to orthotropous..

Isobar :: Isobar (n.) A line connecting or marking places upon the surface of the earth where height of the barometer reduced to sea level is the same either at a given time, or for a certain period (mean height), as for a year; an isopiestic line..

Lune :: Lune (n.) A fit of lunacy or madness; a period of frenzy; a crazy or unreasonable freak.

Infancy :: Infancy (n.) The state or period of being an infant; the first part of life; early childhood.

Geocyclic :: Geocyclic (a.) Circling the earth periodically.

Night :: Night (n.) The period after the close of life; death.

Flow :: Flow (v. i.) To glide along smoothly, without harshness or asperties; as, a flowing period; flowing numbers; to sound smoothly to the ear; to be uttered easily..

Quarantine :: Quarantine (n.) The period of forty days during which the widow had the privilege of remaining in the mansion house of which her husband died seized.

Aberration :: Aberration (n.) A small periodical change of position in the stars and other heavenly bodies, due to the combined effect of the motion of light and the motion of the observer; called annual aberration, when the observer's motion is that of the earth in its orbit, and daily or diurnal aberration, when of the earth on its axis; amounting when greatest, in the former case, to 20.4'', and in the latter, to 0.3''. Planetary aberration is that due to the motion of light and the motion of the planet re

Age :: Age (n.) The people who live at a particular period; hence, a generation..

Primordial :: Primordial (a.) Of or pertaining to the lowest beds of the Silurian age, corresponding to the Acadian and Potsdam periods in American geology. It is called also Cambrian, and by many geologists is separated from the Silurian..

Campaign :: Campaign (n.) The period during which a blast furnace is continuously in operation.

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