IPA: /ˌsoʊ.lə.rɪˈzeɪ.ʃən/
KK: /ˌsoʊlərɪˈzeɪʃən/
A process in photography where the tones of an image are reversed, making dark areas light and light areas dark, often due to overexposure.
The artist used solarization to create a unique effect in her photographs.
Solarization is formed from "solar" (from Latin "solaris", meaning of the sun) and "-ization" (a suffix used to form nouns indicating a process or action). The word refers to the process of exposing something to sunlight or the action of making something solar.
Think of the sun ('solar') and the process of making something happen ('-ization') — that's why solarization means the process of exposing something to sunlight.