IPA: /ˌædæpˈteɪʃənl/
KK: /ædæpˈteɪʃənl/
Related to the process of changing or adjusting something to fit new conditions or uses.
The adaptational changes in the species allowed it to thrive in a new environment.
Adaptational → It is formed from "adapt" (from Latin "adaptare", meaning to adjust or fit) and "-ational" (a suffix forming adjectives meaning relating to or characterized by). The word "adaptational" refers to something that is related to the process of adjusting or fitting to new conditions.
Think of 'adapting' to new situations — 'adapt' means to adjust, and '-ational' indicates it relates to that process.