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ca; -- so named from Trenton Falls, in New York. The rocks are mostly limestones, and the period is divided into the Trenton, Utica, and Cincinnati epochs. See the Chart of Geology.

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 dairy or diurnal aberration, when of the earth on its axis; amountin…

ody moves toward the earth with an acceleration of velocity; -- opposed to retardation. A period of social improvement, or of intellectual advancement, contains within itself a principle of acceleration. I. Taylor. (Astr. & Physics.) Acceleration of the moon, the increase of the moon's mean motion in its orbit, in cons…

The rythmical accent, which marks phrases and sections of a period.

To suspend business for a time, as from one day to another, or for a longer period, or indefinitely; usually, to suspend public business, as of legislatures and courts, or other convened bodies; as, congress adjourned at four o'clock; the court adjourned without day.

The state of growing up from childhood to manhood or womanhood; youth, or the period of life between puberty and maturity, generally considered to be, in the male sex, from fourteen to twenty-one. Sometimes used with reference to the lower animals.

The period including the four Sundays before Christmas. Advent Sunday (Eccl.), the first Sunday in the season of Advent, being always the nearest Sunday to the feast of St. Andrew (Now. 30). Shipley.

A period of immeasurable duration; also, an emanation of the Deity. See Eon.

Next; later in time; subsequent; succeeding; as, an after period of life. Marshall.

The latter part of life; an advanced period of life; seniority; state of being old. Nor wrong mine age with this indignity. Shak.

A fixed star, in Medusa's head, in the constellation Perseus, remarkable for its periodic variation in brightness.

(Geol.) Pertaining to or designating a period or era recognized by the United States Geological Survey and some other authorities, between the Archæan and the Paleozoic, from both of which it is generally separated in the record by unconformities. Algonkian rocks are both sedimentary and igneous. Although fossils are…

A current which periodically changes or reverses its direction of flow.

Constancy during a certain period, or regularly at stated intervals; invariably; uniformly; -- opposed to sometimes or occasionally. He always rides a black galloway. Bulwer.

aplan upon which guests pay for both room and board by the day, week, or other convenient period; -- contrasted with European plan.

The first period, or increase, of a disease; augmentation. [Obs.]

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

; history. The short and simple annals of the poor. Gray. It was one of the most critical periods in our annals. Burke.

from its perihelion. Anomalistic month. See under Month. -- Anomalistic revolution, the period in which a planet or satellite goes through the complete cycles of its changes of anomaly, or from any point in its elliptic orbit to the same again. -- Anomalistic, or Periodical year. See under Year.

Of or relating to the period before the Deluge in Noah's time; hence, antiquated; as, an antediluvian vehicle. -- n.