'approachment' originates from English, specifically formed from the word 'approach' with the suffix '-ment', where 'approach' itself comes from Old French 'aprochier' (from Latin roots meaning 'near').

'approachment' changed from Middle English/Old French forms such as 'approchen'/'aproch' with the noun-forming suffix '-ment' and was used in earlier English as the noun meaning 'the act of approaching'; over time the simpler noun 'approach' largely replaced it.

Initially, it meant 'the act of drawing near'; over time it became archaic and its meaning is now represented by the more common modern word 'approach'.