(n) an amount of time, Syn. period, period of time, Example:a time period of 30 years; hastened the period of time of his recovery; Picasso's blue period
[けい, kei] (n, n-suf) (1) system; lineage; group; (2) { math } corollary; (3) (geological) system (range of strata that correspond to a particular time period); (4) (taxonomical) series; (P)#222
[ごじはっきょう, gojihakkyou] (n) { Buddh } (See 五時教) division of the Buddha's 50-year teachings into five time periods and eight categories (theory of the Tendai sect)