Memento \Me*men"to\, n.; pl. Mementos. [L., remember, be mindful, imper. of meminisse to remember. See Mention.]

A hint, suggestion, token, or memorial, to awaken memory; that which reminds or recalls to memory; a souvenir.

Seasonable mementos may be useful. --Bacon.

Source: Webster's Revised Unabridged Dictionary (1913)