The Collaborative International Dictionary of English v.0.48:
Auxesis \Aux*e"sis\, n. [NL., Gr. ? increase, fr. ?, ?, to increase.] (Rhet.) A figure by which a grave and magnificent word is put for the proper word; amplification; hyperbole. [1913 Webster]WordNet (r) 3.0 (2006):
auxesis n 1: growth from increase in cell size without cell division