GNU Collaborative International Dictionary of English

Found one definition 

  1.       

    Aptitude , n. [F. aptitude, LL. aptitudo, fr. L. aptus. See Apt, and cf. Attitude.]
    1. A natural or acquired disposition or capacity for a particular purpose, or tendency to a particular action or effect; as, oil has an aptitude to burn.
      1913 Webster
      He seems to have had a peculiar aptitude for the management of irregular troops.
      Macaulay.

      1913 Webster
    2. A general fitness or suitableness; adaptation.
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      That sociable and helpful aptitude which God implanted between man and woman.
      Milton.

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    3. Readiness in learning; docility; aptness.
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      He was a boy of remarkable aptitude.
      Macaulay.

      1913 Webster