The Collaborative International Dictionary
Illegitimate \Il`le*git"i*mate\, a.
Not according to law; not regular or authorized; unlawful; improper.
Unlawfully begotten; born out of wedlock; bastard; as, an illegitimate child.
Not legitimately deduced or inferred; illogical; as, an illegitimate inference.
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Not authorized by good usage; not genuine; spurious; as, an illegitimate word.
Illegitimate fertilization, or Illegitimate union (Bot.), the fertilization of pistils by stamens not of their own length, in heterogonously dimorphic and trimorphic flowers.
--Darwin.
Usage examples of "illegitimate union".
The next step will be to overcome the intelligent races of the galaxy, some of them a by-product of Nature, some bastard stepchildren of an illegitimate union between Man and Nature, for many of them would not have had their annoying drives and ambitions without our guidance and example.