diario
daily
diary
a daily record of events
+
-io
adjective suffix
Diario means daily and can be remembered by thinking of a diary0, which is typically written in daily0, plus the adjective suffix1 -io1.
adjective
- dailyDaily; occurring every dayLeo el periódico diario. // I read the daily newspaper.
noun
- diaryA journal or diaryEscribo en mi diario todas las noches. // I write in my diary every night.