Definition of “odd” - Learner’s Dictionary

odd

adjective uk us /ɒd/
STRANGE

B2 strange or unusual:

I always thought there was something odd about her.
It's a bit odd that he didn't come.
NOT OFTEN [ always before noun ]

not happening often:

He does odd jobs here and there.
SEPARATED [ always before noun ]

being one of a pair when the other item is missing:

an odd sock
APPROXIMATELY

used after a number to mean approximately:

There are thirty odd kids in the class.
NUMBER

An odd number does not produce a whole number when it is divided by two.

(Definition of “odd” from the Cambridge Learner's Dictionary © Cambridge University Press)