Memorialize (verb)

To commemorate or honor the memory of a person or event, typically by means of a monument or a ceremony.

Origin:

From the latin word "memorialis" meaning "serving as a reminder".

Examples:

1. The city is planning to memorialize the victims of the 9/11 attacks.
2. They memorialized their loved one with a plaque in the park.
3. The fallen soldiers were memorialized in a ceremony at the war memorial.
4. We are going to memorialize this moment with a photograph.
5. Many people have memorialized the life of Martin Luther King Jr. with a national holiday.