'purposively' originates from English, formed by attaching the adverbial suffix '-ly' to the adjective 'purposive', which itself comes from 'purpose'.

'purposive' developed from the noun 'purpose' (Middle English purpos, from Old French porpos/porpos, ultimately from Latin 'propositum' from 'proponere' meaning 'to put forth'), then English added the adjectival suffix '-ive' and later the adverbial suffix '-ly' produced 'purposively'.

Initially related to 'that which has a purpose' (adjectival sense tied to 'purpose'), it evolved to denote action done with intent, and now 'purposively' means 'in an intentional or deliberate manner'.