Memory.
Synonyms:
recollection, reminiscence, retrospect, retrospection.
remembrance,
Memory is the faculty by which knowledge is retained or recalled; in a more general sense, memory is a retention of knowledge within the grasp of the mind, while remembrance is the having what is known consciously before the mind. Remembrance may be voluntary or involuntary; a thing is brought to remembrance or we call it to remembrance; the same is true of memory. Recollection involves volition, the mind making a distinct effort to recall something, or fixing the attention actively upon it when recalled. Reminiscence is a half-dreamy memory of scenes or events long past; retrospection is a distinct turning of the mind back upon the past, bringing long periods under survey. Retrospection is to reminiscence much what recollection is to remembrance.
Antonyms:
forgetfulness, oblivion, obliviousness, oversight, unconsciousness.