How to Say "trimester" in Spanish
The Spanish word for “trimester” is “trimestre” — A2 level. This is a very common word in everyday Spanish.

Examples
Estamos en el primer trimestre del año.
We are in the first quarter of the year.
Mis notas mejoraron mucho en este segundo trimestre.
My grades improved a lot in this second term.
Las empresas presentan sus resultados cada trimestre.
Companies present their results every quarter.
Always Masculine
Even though it refers to a period of time, 'trimestre' is always a 'boy' word. Always use 'el' or 'un' with it: 'el trimestre' or 'un trimestre'.
Making it Plural
To talk about more than one, simply add an 's' at the end: 'los trimestres'.
Using 'cuarto' for time
Mistake: “El primer cuarto del año.”
Correction: El primer trimestre del año.
Confusion with 4 months
Mistake: “Un trimestre tiene cuatro meses.”
Correction: Un trimestre tiene tres meses.
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