Genuine, real, or legitimate; something that is actually true or authentic rather than fake.
Informal shortened form of 'legitimate,' from Late Latin 'legitimatus' meaning 'made lawful.' The slang version became popular in the 20th century.
'Legit' is linguistic compression—young people shortened 'legitimate' because it's faster, and now it's so common that dictionaries officially recognize it as a word on its own.
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