1. Illegal; against the law.
  2. Born to unmarried parents.
    an illegitimate child
  3. Illogical; incorrectly deduced.
    an illegitimate inference
  4. Not authorized by good usage; not genuine; spurious.
    an illegitimate word
  5. Involving the fertilization of pistils by stamens not of their own length, in heterogonously dimorphic and trimorphic flowers.
    illegitimate union; illegitimate fertilization

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