early 15c., "tendency, likelihood," from Middle French aptitude (14c.) or directly from Late Latin aptitudo (genitive aptitudinis) "fitness," noun of quality from Latin aptus "joined, fitted" (see apt). Meaning "natural capacity to learn" is 1540s; that of "quality of being fit (for a purpose or position)" is from 1640s.
1. Your attitude, not your aptitude, will determine your altitude.--Zig Ziglar
2. An aptitude for computing is beneficial for students taking this degree.