NOTICE›to notice or understand something that you did not notice or understand before: [+ question word]I didn't realize how unhappy she was.I suddenly realized I'd met him before.[+ (that)]Some people just don't seem to realize that the world has changed.
realize an ambition/dream/goal, etc›to achieve something that you have wanted for a long time: He had realized all his ambitions by the age of 30.
SELL›to sell things that you own: to realize your assets
MAKE MONEY›to be sold for a particular amount of money: The shares realized £1.4 million.