'array' originates from Old French, specifically the word 'areier' (also written 'arayer'), where the prefix 'a-' meant 'to' or 'in' and the root related to putting in order or preparing.

'array' changed from the Old French word 'areier'/'arayer' into Middle English as 'arrayen' and eventually became the modern English word 'array'.

Initially, it meant 'to put into order or prepare (especially for battle or display),' but over time it evolved into its current meanings of 'to arrange, set out, or dress/ornament.'