Adjective: More than what is usual, expected, or needed. Noun: Something additional; also, a person with a small, non-speaking role in a film or play. Adverb: To a greater degree than usual.
From Latin *extra* ‘outside, beyond’. It moved from meaning ‘outside’ to meaning ‘beyond the usual amount’.
Calling something ‘extra’ literally means it goes beyond the normal boundary. Modern slang pushes this even further: if someone is ‘so extra,’ their behavior spills way past what the situation really calls for.
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