1. noun /plʌm/
a) The edible, fleshy stone fruit of Prunus domestica, often of a dark red or purple colour.
b) The stone-fruit tree which bears this fruit, Prunus domestica.
2. adjective /plʌm/
a) Of a dark bluish-red colour.
She landed a plum position as an executive for the firm.
3. adverb /plʌm/
Completely; utterly.
Youre going to think Im plum crazy for this, but I want to adopt all seven kittens.
Wikipedia foundation.