1. to keep alive the memory of someone or something, especially by creating a monument or ceremony
Usage: British spelling
2. to present a petition or formal request to an authority
Usage: British spelling; formal

Examples

• The statue memorialises the fallen soldiers of World War II.
• Each year, the ceremony memorialises victims of the tragedy.
• The plaque memorialises her contributions to science.
• The community memorialises its founder with an annual festival.
• The organization memorialises the government for policy changes.
• This monument memorialises all who served their country.