late 14c. (adj.) "preserving the memory of a person or thing," also "something by which the memory of a person, thing, or event is preserved, monument," from L.L. memoriale
, noun use of neut. of L. memorialis
(adj.) "of or belonging to memory," from memoria
"memory" (see memory
). Noun sense of "memorial act, commemoration" is from mid-15c.