The Collaborative International Dictionary of English v.0.48:
exteriorisation \exteriorisation\ n. same as exteriorization. [Brit.] Syn: externalization, externalisation, exteriorization. [WordNet 1.5]WordNet (r) 3.0 (2006):
exteriorisation n 1: embodying in an outward form [syn: externalization, externalisation, exteriorization, exteriorisation]