The Collaborative International Dictionary of English v.0.48:

Memorialize \Me*mo"ri*al*ize\, v. t. [imp. & p. p.
   Memorialized; p. pr. & vb. n. Memorializing.]
   To address or petition by a memorial; to present a memorial
   to; as, to memorialize the legislature. --T. Hook.
   [1913 Webster]