[su.per.pose] vt -posed ; -pos.ing [prob. fr. F superposer, back-formation fr. superposition, fr. LL superposition-, superpositio, fr. L superponere to superpose, fr. super- + ponere to place--more at position] (1823) 1: to place or lay over or above whether in or not in contact: superimpose
2: to lay (as a geometric figure) upon another so as to make all like parts coincide -- su.per.pos.able adj -- su.per.po.si.tion n