A tandem wing is a wing configuration in which a flying craft or animal has two or more sets of wings set one behind another. All the wings contribute to lift.
QAC Quickie Q2
Langley Aerodrome, modified (1914)
Blériot VI Libellule (1907)
A Mignet Pou-du-Ciel
The wing configuration of a fixed-wing aircraft is its arrangement of lifting and related surfaces.
The Spitfire wing may be classified as: "a conventional low-wing cantilever monoplane with unswept elliptical wings of moderate aspect ratio and slight dihedral".