'grammar-centric' originates from the combination of 'grammar' and the suffix '-centric', where 'grammar' refers to the set of rules governing the structure of sentences, and '-centric' means 'centered around or focused on'.

'Grammar' comes from the Old French 'gramaire', which evolved from Latin 'grammatica', and '-centric' is derived from the Greek 'kentrikos', meaning 'pertaining to a center'.

Initially, 'grammar' referred to the study of Latin and Greek, but over time it evolved to mean the study of sentence structure in any language. The suffix '-centric' has consistently meant 'focused on'.