memory noun mem·o·ry \ˈmem-rē, ˈme-mə-\ 1a :  the power or process of reproducing or recalling what has been learned and retained especially through associative mechanisms began to lose his memory as he grew olderb :  the store of things learned and retained from an organism's activity or experience as evidenced by modification of structure or behavior or by recall and recognition has a good memory for faces 2a :  commemorative remembrance erected a statue in memory of the hero