The story
- Latin · derived fromaptus“apt, fit”
- Medieval Latin · derived fromaptitudo
- Middle French · derived fromaptitude
- English todayaptitude
From Middle French aptitude, from Medieval Latin aptitudo, from Latin aptus (“apt, fit”). By surface analysis, apt + -itude. Doublet of attitude.
Words from the same roots
Medieval Latinaptitudo all →
attitude
Latinaptus all →
aptaptamer
Etymology from Wiktionary, CC BY-SA 4.0.