IPA: /ˈwɒtnəs/
KK: /ˈhwɑtnəs/
The essential nature or quality of something; its inherent characteristics.
The whatness of a person can be understood through their actions and beliefs.
Whatness is formed from "what" (from Old English "hwæt", meaning what or which) and the suffix "-ness" (meaning the state or quality of). The word "whatness" refers to the quality or state of being what something is, essentially its essence or nature.
Think of the word 'what' to remember that 'whatness' refers to the quality of being what something is.