: something (such as a note or notification) designed to prompt or aid the memory She wrote a reminder about the meeting in her calendar. I run the risk of missing a reminder because I often silence my phone when I am on the air or recording in the studio.

a written or spoken message that reminds someone to do something: If he forgot to pay his rent, his landlady would send him a reminder. [ + to infinitive ] Mom sent me off with a final reminder to be back before 11 p.m.

reminder noun /rɪˈmaɪndə (r)/ /rɪˈmaɪndər/ something that makes you think about or remember somebody/something, that you have forgotten or would like to forget reminder of something The sheer size of the cathedral is a constant reminder of the power of religion.

reminder noun [ C ] uk / rɪˈmaɪndə r/ us something that makes you remember something else: Her scars are a constant reminder of the attack.