The Collaborative International Dictionary of English v.0.48:

Carnal \Car"nal\, a. [L. carnalis, fr. caro, carnis, flesh; akin
   to Gr. ?, Skr. kravya; cf. F. charnel, Of. also carnel. Cf.
   Charnel.]
   1. Of or pertaining to the body or its appetites; animal;
      fleshly; sensual; given to sensual indulgence; lustful;
      human or worldly as opposed to spiritual.
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            For ye are yet carnal.                --1 Cor. iii.
                                                  3.
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            Not sunk in carnal pleasure.          --Milton
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            Carnal desires after miracles.        --Trench.
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   2. Flesh-devouring; cruel; ravenous; bloody. [Obs.]
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            This carnal cur
            Preys on the issue of his mother's body. --Shak.
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   Carnal knowledge, sexual intercourse; -- used especially of
      an unlawful act on the part of the man.
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WordNet (r) 3.0 (2006):

carnal knowledge
    n 1: the act of sexual procreation between a man and a woman;
         the man's penis is inserted into the woman's vagina and
         excited until orgasm and ejaculation occur [syn: sexual
         intercourse, intercourse, sex act, copulation,
         coitus, coition, sexual congress, congress, sexual
         relation, relation, carnal knowledge]