simple past tense and past participle of period

Designating anything from a given historical era. / Evoking, or appropriate for, a particular historical period, especially through the use of elaborate costumes and scenery.

(chiefly Canada, US) That's final; that's the end of the matter (analogous to a period ending a sentence); end of story.

(obsolete, intransitive) To come to a period; to conclude. / (obsolete, transitive, rare) To put an end to.

A publication issued regularly, but less frequently than daily.

Periodic. / Published at regular intervals of more than one day, especially weekly, monthly, or quarterly. / Of, or relating to such a publication.

Relative to a period or periods. / Having repeated cycles. / Occurring at regular intervals. / Periodical. / (astronomy) Pertaining to the revolution of a celestial object in its orbit.

(inorganic chemistry) Either of two oxyanions of iodine; any salt containing these anions

plural of periodate

happening again and again after regular times