Roget's Thesaurus: Entry 108 (Definite duration, or portion of time)

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#108. [Definite duration, or portion of time.] Period. -- N. period, age, era; second, minute, hour, day, week, month, quarter, year, decade, decenniumm lustrum[obs], quinquennium, lifetime, generation; epoch, ghurry[obs], lunation[obs], moon.

century, millennium; annus magnus[Lat].

Adj. horary[obs]; hourly, annual &c. (periodical) 138. #108a. Contingent Duration.-- Adv. during pleasure, during good behavior; quamdiu se bene gesserit[Latin].