1. (n.) A portion of time as limited and determined by some recurring phenomenon, as by the completion of a revolution of one of the heavenly bodies; a division of time, as a series of years, months, or days, in which something is completed, and ready to recommence and go on in the same order; as, the period of the sun, or the earth, or a comet.

2. (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.

3. (n.) One of the great divisions of geological time; as, the Tertiary period; the Glacial period. See the Chart of Geology.

4. (n.) The termination or completion of a revolution, cycle, series of events, single event, or act; hence, a limit; a bound; an end; a conclusion.

5. (n.) A complete sentence, from one full stop to another; esp., a well-proportioned, harmonious sentence.

6. (n.) The punctuation point [.] that marks the end of a complete sentence, or of an abbreviated word.

7. (n.) One of several similar sets of figures or terms usually marked by points or commas placed at regular intervals, as in numeration, in the extraction of roots, and in circulating decimals.

8. (n.) The time of the exacerbation and remission of a disease, or of the paroxysm and intermission.

9. (n.) A complete musical sentence.

10. (v. t.) To put an end to.

11. (v. i.) To come to a period; to conclude. [Obs.] You may period upon this, that, etc.

Alexandrine Archean Archeozoic Cambrian Carboniferous Cenozoic Comanchean Cretaceous Devonian Eocene Glacial Holocene Lower Cretaceous Lower Tertiary Mesozoic Miocene Mississippian Oligocene Paleocene Paleozoic Pennsylvanian Permian Pleistocene Pliocene Precambrian Proterozoic Quaternary Recent Silurian Tertiary Triassic Upper Cretaceous Upper Tertiary Z accent accentuation adjectival phrase aeon age amount amphibrach amphimacer amplitude anacrusis anapest annual period antinode antispast aphelion apodosis apogee arsis astronomical longitude autumnal equinox bacchius baseball season basketball season bass passage beat boundary bourdon bridge burden cadence caesura caliber catalexis catamenia catamenial discharge catastrophe ceasing celestial equator celestial longitude celestial meridian cessation chloriamb chloriambus chorus chronology circle clause close closing closure coda cold season colon colures comma compass concert season conclusion construction consummation continuity counterpoint courses crack of doom crest cretic culmination curtain curtains cut dactyl days de Broglie wave death decease degree denouement destination destiny development diaeresis diffraction dimeter dipody discontinuance division dochmiac doom dry season duration duree ecliptic effect electromagnetic wave elegiac elegiac couplet elegiac pentameter emphasis end end point ending envoi epilogue epitrite epoch equator equinoctial equinoctial circle equinoctial colure equinox era eschatology expiration exposition expression extent fate feminine caesura figure final solution final twitch final words finale finality finis finish flowers folderol foot football season frequency frequency band frequency spectrum full stop galactic longitude geocentric longitude geodetic longitude goal grade great circle guided wave harmonic close headed group height heliocentric longitude heptameter heptapody heroic couplet hexameter hexapody iamb iambic iambic pentameter ictus idiom idiotism in phase interference interlude intermezzo interval introductory phrase ionic izzard jingle juncture last last breath last gasp last things last trumpet last words lastingness latter end leap level light lilt locution longitude longitudinal wave manner of speaking mark masculine caesura measure mechanical wave menses menstrual discharge menstruation meridian meter metrical accent metrical foot metrical group metrical unit metron molossus monthlies mora movement musical phrase musical sentence node notch noun phrase nuance numbers off season omega orbit ornament out of phase paeon paragraph part pas passage patch pause payoff