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Babyhood :: Babyhood (n.) The state or period of infancy.

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

Undecennial :: Undecennial (a.) Occurring or observed every eleventh year; belonging to, or continuing, a period of eleven years; undecennary; as, an undecennial festival..

Catskill Period :: Catskill period () The closing subdivision of the Devonian age in America. The rocks of this period are well developed in the Catskill mountains, and extend south and west under the Carboniferous formation. See the Diagram under Geology..

Alabama Period :: Alabama period () A period in the American eocene, the lowest in the tertiary age except the lignitic..

Megrim :: Megrim (n.) A kind of sick or nevrous headache, usually periodical and confined to one side of the head..

Month :: Month (n.) One of the twelve portions into which the year is divided; the twelfth part of a year, corresponding nearly to the length of a synodic revolution of the moon, -- whence the name. In popular use, a period of four weeks is often called a month..

Perpetuity :: Perpetuity (n.) The quality or condition of an estate by which it becomes inalienable, either perpetually or for a very long period; also, the estate itself so modified or perpetuated..

Job :: "Job (v. t.) To hire or let by the job or for a period of service; as, to job a carriage..

Period :: Period (n.) A stated and recurring interval of time; more generally, an interval of time specified or left indefinite; a certain series of years, months, days, or the like; a time; a cycle; an age; an epoch; as, the period of the Roman republic..

Algol :: Algol (n.) A fixed star, in Medusa's head, in the constellation Perseus, remarkable for its periodic variation in brightness..

Jurassic :: Jurassic (n.) The Jurassic period or formation; -- called also the Jura.

Exuviability :: Exuviability (n.) Capability of shedding the skin periodically.

Revival :: Revival (n.) Renewed interest in religion, after indifference and decline; a period of religious awakening; special religious interest..

Cycle :: Cycle (n.) An interval of time in which a certain succession of events or phenomena is completed, and then returns again and again, uniformly and continually in the same order; a periodical space of time marked by the recurrence of something peculiar; as, the cycle of the seasons, or of the year..

Rh/tic :: Rh/tic (a.) Pertaining to, or of the same horizon as, certain Mesozoic strata of the Rhetian Alps. These strata are regarded as closing the Triassic period. See the Chart of Geology..

Sentence :: Sentence (n.) A combination of words which is complete as expressing a thought, and in writing is marked at the close by a period, or full point. See Proposition, 4..

Age :: Age (n.) A great period in the history of the Earth.

Decline :: Decline (v. i.) That period of a disorder or paroxysm when the symptoms begin to abate in violence; as, the decline of a fever..

Epoch :: Epoch (n.) A period of time, longer or shorter, remarkable for events of great subsequent influence; a memorable period; as, the epoch of maritime discovery, or of the Reformation..

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