When you memorialize something, you honor it or do something so it will be remembered. If you want to remember a summer trip taken with friends, you could make a photo album full of the pictures you took to memorialize it.
The word memorialize often is used in relation to someone or something that has passed away or even to a group of connected individuals who have perished. You might see a monument, for example, that memorializes victims of an earthquake, meaning pays tribute to them. You can also memorialize someone in a speech, meaning you tell about the person's life and describe how he or she has affected others.
