Where does “a part” come from?

a part (Middle English) comes from Anglo-Norman a part, from Latin ad partem — to the side.

Ancestry of “a part”, step by step

StepLanguageWordMeaning
1Anglo-Normana part—
2Latinad partemto the side
Every word from Latin ad partem →Every word from Anglo-Norman a part →
a part — Etymology, Origin & Word History | Etymology Explorer