'colloquial' originates from Latin, specifically the word 'colloquium,' where 'col-' meant 'together' and 'loqui' meant 'to speak.'

'colloquium' transformed into the Late Latin word 'colloquialis,' and eventually became the modern English word 'colloquial.'

Initially, it meant 'pertaining to conversation,' but over time it evolved into its current meaning of 'used in ordinary conversation.'