mates

Adjective

 * 1) Friendly; having a friendship (with).
 * He is mates with my brother.

Usage notes

 * Only used as a predicate.

Synonyms

 * (British), chums (British), friendly, friends, pally (British), pals (British)

Noun

 * 1)  maths

Etymology 1
.

Noun

 * 1)  maths, math (study)