reminder
1. [ noun ] a message that helps you remember something
Examples:

"he ignored his wife's reminders"

Related terms: message phylactery remind
2. [ noun ] an experience that causes you to remember something
Related terms: experience deja_vu shades_of memento memento_mori remind
3. [ noun ] someone who gives a warning so that a mistake can be avoided
Synonyms: monitor admonisher
Related terms: defender warn
Similar spelling:   remind
  remainder
  remindful
  remand
  remain_down