o'

preposition

ə,

ō 

variants or less commonly o

1

chiefly dialectal : on

2

: of

one o'clock

Word History

Etymology

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

First Known Use

13th century, in the meaning defined at sense 1

Kids Definition

o'

preposition

variants also o

ə 

: of

one o'clock