–noun 1. any style of decor, fashion or entertaining resulting from the crossing of different breeds or varieties. ...Word Origin and History... Style: 1250–1300; ME (n.); L stylus, sp. var. of stilus tool for writing, hence, written composition, style... Mongrel: late 15c., "mixed breed dog," from obs. mong "mixture," from O.E. gemong "mingling" (base of among), from P.Gmc. *mong- "mix."