'equal-dimensioned' originates from English, specifically the words 'equal' + 'dimension' with the adjectival suffix '-ed', where 'equal' meant 'having the same measure' and 'dimension' meant 'extent in a particular direction'.

'equal' comes from Latin 'aequalis' through Old French and Middle English; 'dimension' comes from Latin 'dimensio' (past participle of 'dimetiri'/'dimetrare'), and the compound form 'equal-dimensioned' is a modern English coinage formed by combining these elements to describe objects with matching measurements.

Initially, the component words meant 'having the same measure' ('equal') and 'an extent or measure' ('dimension'); over time the compound came to be used specifically to describe objects or forms that are 'made or measured to have the same dimensions', which is its current usage.