'geologic' originates from Greek, specifically the word 'geōlogikos,' where 'geo-' meant 'earth' and '-logikos' meant 'pertaining to study or science.'

'geōlogikos' transformed into the French word 'géologique,' and eventually became the modern English word 'geologic' through Middle English.

Initially, it meant 'pertaining to the study of the Earth,' and this meaning has largely remained the same in modern usage.