Longman Dictionary of Contemporary English homepage

reminder

 noun
     
re‧mind‧er [countable]
1 something that makes you notice, remember, or think about something
reminder of
a reminder of the dangers of drinking and driving
reminder that
Occasional bursts of gunfire are a reminder that the rebels are still active.
constant/painful/vivid etc reminder
The damaged church was preserved as a stark reminder of the horrors of war.
The drop in stock prices serves as a reminder (=is a reminder) that investing is a form of gambling.
2 something, for example a letter, that reminds you to do something which you might have forgotten:
a reminder from the dentist for your check-up
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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