illegitimate : Idioms & Phrases
illegitimate child
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noun the illegitimate offspring of unmarried parents
bastard; whoreson; illegitimate; by-blow; love child.
WordNet
illegitimate enterprise
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noun an illegal enterprise (such as extortion or fraud or drug peddling or prostitution) carried on for profit
racket; fraudulent scheme.
WordNet
Illegitimate fertilization , ∨ Illegitimate union
(Bot.) , the fertilization of pistils by stamens not of their own length, in heterogonously dimorphic and trimorphic flowers.