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O Canada
o’clock
O/D
o.d. (1)
o.d. (2)
o’er
o.g.
O grade
O level
O & M
o.n.o.
o’nyong-nyong fever
o.o.
O.O.D.
O’Odham
O-ring
O/S
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o (1)

o [ ō ] (plural o's) or O (plural O's or Os)


noun 
Definition:
 
1. 15th letter of English alphabet: the 15th letter of the English alphabet, representing a vowel sound

2. letter 'o' written: a written representation of the letter 'o'

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