'phonological' originates from Greek, specifically the word 'phōnē,' where 'phōnē' meant 'voice' or 'sound.'

'phōnē' transformed into the French word 'phonologie,' and eventually became the modern English word 'phonology' through Middle English.

Initially, it meant 'related to sound,' but over time it evolved into its current meaning of 'relating to the system of sounds in a language.'