aplenty

The word 'aplenty' originates from the Middle English phrase 'in plente', meaning 'in abundance'. The preposition 'a-' is a reduced form of the Old English preposition 'on' or 'in', which fused with the noun 'plenty' from Old French. This fusion created an adverbial form that functioned as a single lexical unit. Over time, its usage expanded to also serve as a postpositive adjective, directly inheriting the core concept of 'fullness' from its Latin root 'plenus', and has consistently denoted a state of abundant supply.

This word is a lexicalized fusion of the Middle English phrase 'in plente', where 'plente' is from Old French 'plenté', meaning 'fullness, abundance', itself from Latin 'plenitatem' (nominative 'plenitas'), meaning 'fullness', from 'plenus' ('full').