'grammar-dependent' originates from the combination of 'grammar' and 'dependent', where 'grammar' refers to the set of structural rules governing the composition of clauses, phrases, and words in a language, and 'dependent' means relying on something else for support.

'Grammar' comes from the Old French 'gramaire', which evolved from the Latin 'grammatica', and 'dependent' comes from the Latin 'dependere', meaning 'to hang from'.

Initially, 'grammar' referred to the study of Latin and its literature, but over time it evolved to mean the rules of language structure, while 'dependent' has maintained its meaning of reliance.