American Heritage® Dictionary of the English Language, Fourth Edition
- prep. Informal Of: lots o' luck; top o' the morning.
GNU Webster's 1913
- 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)
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Long ago, I learned a useful habit from a good friend: Every time he looked up a word in his dictionary, he’d put a mark next to it. His explanation for this was vague at best, but I understood a...
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