oh

UK: /ˈəʊ/ US: /oʊ/ ,(ō)

Inflections of 'oh' (n):

oh's

npl

ohs

npl

WordReference Random House Learner's Dictionary of American English © 2026

oh /oʊ/   interj., n., pl. oh's, ohs. 
interj. 

1. (used to express surprise, pain, disapproval, sympathy, agreement, and other emotions):
   Oh! What's that noise?
2. (used when speaking to another to attract that person's attention):
   Oh, waiter!
3. (used when the speaker is hesitating, thinking, guessing, etc.:
   The fish must have weighed, oh, six or seven pounds.

n. [countable]

4. the saying of the word "oh.''

OH,  an abbreviation of:

1. Place Names Ohio.

WordReference Random House Unabridged Dictionary of American English © 2026

oh  (ō), interj., n., pl. oh's, ohs, v. 
interj. 

1. (used as an expression of surprise, pain, disapprobation, etc.)
2. (used in direct address to attract the attention of the person spoken to):
   Oh, John, will you take these books?

n. 
3. the exclamation "oh.''

v.i. 
4. to utter or exclaim "oh.''
• later spelling, spelled of O, from mid-16th century

Oh  (ō), n. 

Sa•da•ha•ru  (sä′də här′o̅o̅), born 1940, Chinese baseball player in Japan.

OH, 

1. Ohio (approved esp. for use with zip code).

Collins Concise English Dictionary © HarperCollins Publishers::

oh / əʊ/ interjection

1. an exclamation expressive of surprise, pain, pleasure, etc

Collins Concise English Dictionary © HarperCollins Publishers::

OH abbreviation

1. Ohio