The story
- Medieval Latin · derived frompēnsiōnārius
- Old French · derived frompensionnier
- Anglo-Norman · derived frompensionner
- Middle English · inherited frompensioner
- English todaypensioner
From Middle English pensioner, from Anglo-Norman pensionner and Old French pensionnier, from Medieval Latin pēnsiōnārius. By surface analysis, pension + -er.
Etymology from Wiktionary, CC BY-SA 4.0.