Transposition is an L-derivation which only transposes a lexical item from one lexical class, i.e. N, V, A, to another. For example, the deadjectival nominalization which generate importance and creativity from important and creative, respectively, adds no semantic content nor modifies any inherent feature of the underlying A; it merely changes the adjective into a noun. The meaning of important is simply 'having importance'. The nominalization allows that meaning 'importance' to be expressed as a referential term rather than as a quality.