If anyone should phone, say I will be back at one o'clock.
2
adverb (fukushi)noun (common) (futsuumeishi)once;at one time;formerly;before
彼は一時ここに住んでいた。
He lived here for a time.
3
adverb (fukushi)noun (common) (futsuumeishi)nouns which may take the genitive case particle 'no'for a time;for a while;for the time being;for the moment;temporarily
in weather forecasts, indicates that a given condition will hold for less than one quarter of the forecast period