means The act of recalling or honoring someone or something from the past, especially a person who has died or an event worth memorializing.

from From the Old French remembrance, built on the verb remembrer, which traces back to Latin rememorari — re- ('again') plus memor ('mindful'). That same memor sits at the root of memory, memorial, and the whole family of words about holding the past in mind. Remembrance entered English in the medieval period through French, and from the start it carried weight beyond simple recollection: not just to recall, but to call back, deliberately and with feeling.