Mate/meɪt/ Definition 1 of 8Pro Tip 1/3Informality Used in informal settings, often among friends or peers. Having a beer with my mates after work. Pro Tip 2/3Gender Neutral Can be used for people of any gender, not males only. She's been my mate since high school. Pro Tip 3/3Regional Usage More common in British English and can be perceived as less usual in American English. In America, people don't often say 'mate'.