\Apt"i*tude\, 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.
         He seems to have had a peculiar aptitude for the
         management of irregular troops.       --Macaulay.
2. A general fitness or suitableness; adaptation.
         That sociable and helpful aptitude which God
         implanted between man and woman.      --Milton.
3. Readiness in learning; docility; aptness.
         He was a boy of remarkable aptitude.  --Macaulay.