mid 16th century: from Latin procrastinat- ‘deferred till the morning’, from the verb procrastinare, from pro- ‘forward’ + crastinus ‘belonging to tomorrow’ (from cras ‘tomorrow’)
16世紀半ば:ラテン語のprocrastinat-「朝まで延期」に由来し、動詞procrastinareはpro-「前へ」+crastinus「明日に属する」(cras「明日」に由来)から。