hey
interj. A1 Beginner Oxford US //ˈheɪ// UK //hˈeɪ// hey
interj. a word you use to get someone's attention or to say hello in a friendly way. You can also use it to show that you are surprised or angry.
interj. an utterance used to attract attention, express greeting, or signal surprise or protest. Informal in register; its pragmatic function depends heavily on intonation and context.
Hey, look at that beautiful bird over there.
Hey, I haven't seen you in ages — how have you been lately?
Hey, you can't just walk in here without an appointment and expect to see the manager immediately.
Usage
Often followed by a comma in writing; functions as a sentence-initial discourse marker.