Other forms: memorised, memorising
To memorise something is to learn it so thoroughly that you can repeat it exactly. A poem, a part, a long number.
This is the British spelling with an s, and American English writes it with a z, and both are correct in either country. The word is about deliberate work, which separates it from simply remembering. Actors, musicians and medical students do a great deal of it. The related noun is memory, and rote learning is the name for memorising without understanding, which teachers argue about endlessly.
1verbmemoriseTo learn something so that it can be repeated from memory.
“He had memorised every line before the first rehearsal.”
Also accepted in games: memorize