How to Say "diary" in Spanish
The most common Spanish word for “diary” is “diario” — use 'diario' when referring to a personal journal or a book where you write down your thoughts, feelings, and daily experiences..
diario
dee-AH-reeo/diˈa.rjo/

Examples
Me gusta escribir en mi diario cada noche antes de dormir.
I like to write in my diary every night before sleeping.
Escribí todos mis sueños en mi diario personal.
I wrote all my dreams in my personal diary.
Mi abuela encontró un diario que su padre escribió durante la guerra.
My grandmother found a journal that her father wrote during the war.
Possessive Adjectives
When talking about your own diary, use possessive words like 'mi diario' (my diary) or 'su diario' (his/her diary).
agenda
ah-HEN-dah/aˈxenda/

Examples
Tengo que apuntar la cita del médico en mi agenda.
I have to write down the doctor's appointment in my planner.
Necesito una nueva agenda para el año que viene.
I need a new planner for next year.
Voy a anotar la reunión en mi agenda electrónica.
I am going to write down the meeting in my electronic diary (or planner).
Mi agenda está completamente llena mañana.
My schedule is completely full tomorrow.
A Feminine Noun
Remember that 'agenda' is a feminine word, even though it ends in 'a' (like many masculine words). You always say 'la agenda' or 'una agenda'.
Journal vs. Planner
Related Translations
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