Real Dictionary

memorial
A memorial event, object, or prize is in honour of someone who has died, so that they will be remembered.
If you say that something will be a memorial to someone who has died, you mean that it will continue to exist and remind people of them.
countable noun: A memorial is a structure built in order to remind people of a famous person or event.

memorial in American English
anything made or done in memory of some person or event, as a monument, trust fund, holiday, charitable donation, etc.
serving to help people remember some person or event; commemorative
adjective: preserving the memory of a person or thing; commemorative
noun: something designed to preserve the memory of a person, event, etc., as a monument or a holiday

memorial in British English
adjective: serving to preserve the memory of the dead or a past event
noun: something serving as a remembrance