A person who chooses or makes selections; someone engaged in the act of choosing.
From 'choose' (Old English 'ceosan') plus the agent suffix '-er,' which indicates someone who performs the action of the verb.
The '-er' suffix creates some of English's most common words—'teacher,' 'runner,' 'chooser'—and it's so productive that any English speaker can invent a new one (like 'binge-watcher') and everyone understands it instantly!
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