Definition of oh exclamation from the Oxford Advanced Learner's Dictionary



    (especially literary O) exclamation
    BrE BrE//əʊ//
    ; NAmE NAmE////
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  1. 1  used when you are reacting to something that has been said, especially if you did not know it before ‘I saw Ben yesterday.’ ‘Oh yes, how is he?’ Oh dear! What's happened now? You can’t come tonight? Oh well, see you next week then. ‘Emma has a new job.’ ‘Oh, has she?’
  2. 2  used to express surprise, fear, joy, etc. Oh, how wonderful! Oh no, I've broken it!
  3. 3  used to attract somebody’s attention Oh, Sue! Could you help me a moment?
  4. 4  used when you are thinking of what to say next I've been in this job for, oh, about six years. More Like This Exclamations aargh, ah, aha, ahchoo, ahem, aw, bah, boo, coo, d’oh, eek, eh, er, eww, gee, ha, hey, ho ho, ho-hum, hooray, huh, mm, oh, oho, oi, ooh, oops, ouch, ow, oy, pah, phew, psst, sh, tsk tsk, tut, ugh, uh, uh-uh, uh-oh, um, whoopee, whoops, woo hoo, wow, yay, yippee, yuck, yumSee worksheet.
  5. Word Originmid 16th cent.: variant of O.
See the Oxford Advanced American Dictionary entry: oh