'glossary' originates from Latin, specifically the word 'glossarium,' where 'glossa' meant 'language' or 'tongue.'

'glossarium' transformed into the Old French word 'glossaire,' and eventually became the modern English word 'glossary' through Middle English.

Initially, it meant 'a collection of glosses or explanations,' but over time it evolved into its current meaning of 'a list of terms with definitions.'