The term "split-level" is a modern English compound, originating in mid-20th century architectural terminology. It directly combines the verb "split," with its Germanic roots conveying the action of dividing, and the noun "level," descended from Latin via French, denoting a horizontal plane or storey. The compound's logic is transparently descriptive: it denotes a building style where the living areas are intentionally divided and situated on partially offset floor planes. This creates a distinct architectural form that separates functional zones while maintaining an open flow, a concept neatly encapsulated by the literal meaning of its two constituent morphemes.

Structure: split (divide) + level (flat surface) - split: From Middle Dutch splitten, of Germanic origin, meaning to cleave or divide. In this compound, it functions as a modifier indicating a division or separation. - level: From Old French livel, ultimately from Latin libella, a diminutive of libra (balance, scale). In this compound, it functions as the core noun, referring to a plane or storey of a building.