'appointer' originates from Middle English, ultimately from Old French 'apointer', where the prefix/root 'ad-' (involved in the formation) meant 'to/toward' and the element related to 'punct-'/'point' meant 'point or mark'.

'appointer' developed from Old French 'apointer' (to bring to a point, to fix/appoint), passed into Middle English with similar form and sense, and eventually became the modern English noun 'appointer' meaning 'one who appoints'.

Initially connected with the idea of fixing, setting, or bringing to a point, the sense shifted over time toward 'to assign or designate', and the modern meaning is 'one who appoints or designates someone to a post'.