from The American Heritage® Dictionary of the English Language, 4th Edition
- prep. Informal Of: lots o' luck; top o' the morning.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- prep. apocopic form of of
from the GNU version of the Collaborative International Dictionary of English
- A prefix to Irish family names, which signifies grandson or descendant of, and is a character of dignity.
- prep. A shortened form of of or on.
Middle English o, a, shortening of of; see of.(American Heritage® Dictionary of the English Language, Fourth Edition)