The Collaborative International Dictionary of English v.0.48:
Legalization \Le`gal*i*za"tion\ (l[=e]`gal*[i^]*z[=a]"sh[u^]n), n. The act of making legal. [1913 Webster]WordNet (r) 3.0 (2006):
legalization n 1: the act of making lawful [syn: legalization, legalisation, legitimation]