1fair or reasonable: That’s a perfectly legitimate question. Most scientists believe it is legitimate to use animals in medical research.2acceptable or allowed by law: Their business operations are perfectly legitimate.3a legitimate child is born to parents who are legally married to each otherOPP illegitimate—legitimately adverb: a legitimately elected government He complained quite legitimately about his treatment.—legitimacy noun [uncountable]: Opponents have questioned the legitimacy of the ruling.
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