1 o\' | Definition of o\'
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o'

preposition
\ ə, ō How to pronounce o' (audio) \
variants: or less commonly o

Definition of o'

1 chiefly dialectal : on
2 : of one o'clock

First Known Use of o'

13th century, in the meaning defined at sense 1

History and Etymology for o'

Middle English o, o-, contraction of on & of

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