Other forms: memorized, memorizing, memorizes
To memorize something is to learn it so thoroughly that you can say it with nothing in front of you. A poem, a phone number, a part in a play.
The word is about deliberate effort, which separates it from simply remembering: you remember your childhood without trying and you memorize a speech on purpose. Actors, students and musicians do it professionally. British English usually spells it with an s, and both spellings are accepted everywhere. Note that memorize means to get it in, while recall means to get it out again.
1verbmemorizeTo learn something so well that it can be repeated from memory.
“He memorized the whole route before setting off.”
Also accepted in games: memorise, learn by heart