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legitimate (adj.)

mid-15c., "lawfully begotten, born of parents legally married," from past partixiple of Old French legitimer and directly from Medieval Latin legitimatus, past participle of legitimare "make lawful, declare to be lawful," from Latin legitimus "lawful," originally "fixed by law, in line with the law," from lex (genitive legis) "law" (see legal). Transferred sense of "genuine, real" is attested from 1550s. Related: Legitimately; legitimateness. The older adjective in English was legitime "lawful, of legitimate birth" (late 14c.), from Old French legitime, from Latin legitimus.

legitimate (v.)

"establish the legitimacy of, make lawful," 1590s, from Medieval Latin legitimatus, past participle of legitimare "make lawful" (see legitimate (adj.)). Related: Legitimated; legitimating.

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Definitions of legitimate from WordNet
1
legitimate (adj.)
of marriages and offspring; recognized as lawful;
legitimate (adj.)
based on known statements or events or conditions;
Synonyms: logical
legitimate (adj.)
in accordance with recognized or accepted standards or principles;
legitimate advertising practices
legitimate (adj.)
authorized, sanctioned by, or in accordance with law;
a legitimate government
Synonyms: lawful / licit
2
legitimate (v.)
make legal;
Synonyms: legalize / legalise / decriminalize / decriminalise / legitimize / legitimise / legitimatize / legitimatise
legitimate (v.)
show or affirm to be just and legitimate;
legitimate (v.)
make (an illegitimate child) legitimate; declare the legitimacy of (someone);
From wordnet.princeton.edu