ひとむかし 一昔 Common word LinksSentence search for 一昔Sentence search for ひとむかしSentence search for ひと昔Kanji details for 一 and 昔Edit in JMdict Noun1. an age (ago); a long time (ago); a decade (ago)Other formsひと昔 【ひとむかし】 Discussions Log in to talk about this word.