(of a whole number) not divisible by two without a remainder
Seven is an odd number.
If you add two odd numbers, the result is even.
strange or unusual; different from what most people expect
Everyone thought the new sculptor was odd, but his work was fascinating.
Sam has an odd habit of talking to his plants every morning.
✦ From Middle English odde, from Old Norse oddi “angle, point, odd number”, later “single, left over”.
happening occasionally and not regularly or often
He earns extra money by doing odd jobs on weekends.
I drop by my grandparents’ house at the odd weekend.
left over or unmatched in a set or pair
I can’t find the other sock; this is the odd one.
There was an odd chair left after everyone had taken a seat.
(after numbers) a little more than; approximately
About thirty-odd people showed up for the meeting.
The old castle is twelve-odd miles from here.