IPA: /ˌɪntəˈɡreɪdʒən/
KK: /ˌɪntərˈɡreɪdʒən/
A gradual merging or blending of two different things, often referring to populations or species.
The intergradation of the two species resulted in a new hybrid that displayed traits from both.
Intergradation → It is formed from "inter-" (meaning between) and "gradus" (meaning step or degree). The word describes a process that occurs between different stages or degrees, indicating a gradual transition.
Think of something that happens 'between' ('inter-') different 'steps' ('gradus') — that's why intergradation refers to a gradual transition between stages.