factorEnglishOxford American Thesaurusfactor noun 1 this had been a key factor in his decision to withdraw: element, part, component, ingredient, strand, constituent, point, detail, item, feature, facet, aspect, characteristic, consideration, influence, circumstance, thing, determinant. 2 Scottish he worked as a factor in Perthshire: agent, representative, deputy, middleman, intermediary, go-between; estate manager, land agent, land steward, reeve.