noun
(theater, slang) A legitimate; a legitimate actor.
(slang) A legitimate child.
adjective
(informal) Legitimate; legal; allowed by the rules; valid.
(by extension, of a thing or person) Genuine, actual, literal or honest.
(slang) Genuinely good and possessing all the required or expected qualities; the real deal.
(slang) Cool by virtue of being genuine.
adverb
(informal) Legitimately; within the law.
(slang) Honestly; truly; seriously.