Definition of period adverb from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈpɪəriəd//
; NAmE NAmE//ˈpɪriəd//
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(especially North American English) (British English also full stop) (informal) used at the end of a sentence to emphasize that there is nothing more to say about a subject The answer is no, period! Word Originlate Middle English (denoting the time during which something, especially a disease, runs its course): from Old French periode, via Latin from Greek periodos ‘orbit, recurrence, course’, from peri- ‘around’ + hodos ‘way, course’. The sense ‘portion of time’ dates from the early 17th cent.
See the Oxford Advanced American Dictionary entry: period