'facilitatory' originates from Latin, specifically the Late Latin verb 'facilitare' (to make easy), itself related to the adjective 'facilis' meaning 'easy'.

'facilitatory' developed via the verb 'facilitate' (from Late Latin 'facilitare') which entered English through French/Latin influence; the adjective form 'facilitatory' was later formed in English from that verb.

Initially related to 'easy' or 'to make easy' in Latin ('facilis'/'facilitare'); over time it evolved into the English adjective meaning 'serving to make something easier' or 'promoting a process'.