The Collaborative International Dictionary of English v.0.48:
Vacuolation \Vac"u*o*la"tion\, n. (Biol.) Formation into, or multiplication of, vacuoles. [1913 Webster]WordNet (r) 3.0 (2006):
vacuolation n 1: the state of having become filled with vacuoles [syn: vacuolization, vacuolisation, vacuolation]