mate
n. countable B2 Upper Intermediate Oxford US //ˈmeɪt// mate
n. a friend or a person you work with. In the UK and Australia, people often use it to address a man in a friendly way.
n. a companion, fellow worker, or partner. Often used as a vocative in informal British and Australian English to address a male peer.
I am going to the cinema with a mate tonight.
He has been my best mate since we were in primary school together.
Usage
Commonly used as a term of address; in nautical contexts, refers to a specific rank of officer below the captain.