Pronunciation: (ap'ti-tOOd", -tyOOd"), [key]
1. capability; ability; innate or acquired capacity for something; talent: She has a special aptitude for mathematics.
2. readiness or quickness in learning; intelligence: He was placed in honors classes because of his general aptitude.
3. the state or quality of being apt; special fitness.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.