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il‧le‧git‧i‧mate

1 born to parents who are not married [≠ legitimate]:
his illegitimate son
his illegitimate son2 not allowed or acceptable according to rules or agreements [≠ legitimate]:
a distinction between legitimate and illegitimate trade
a distinction between legitimate and illegitimate trade —illegitimately adverb
—illegitimacy noun [uncountable]
