How to Say "missionary" in Spanish
The Spanish word for “missionary” is “misionero” — B1 level.

Examples
El misionero construyó una escuela en el pueblo.
The missionary built a school in the village.
Trabajó como misionero durante cinco años en el extranjero.
He worked as a missionary for five years abroad.
Muchos misioneros dedican su vida a ayudar a los más necesitados.
Many missionaries dedicate their lives to helping those most in need.
Dropping the 'A' or 'An'
When you say someone IS a missionary using the verb 'ser', you don't need to use 'un' (a). Just say 'Él es misionero'.
Changing for Gender
This specific word refers to a man. To talk about a woman, you would change the ending to an 'a' (misionera).
Using 'un' with professions
Mistake: “Él es un misionero.”
Correction: Él es misionero. (In Spanish, we don't use 'a/an' when stating someone's job or role after 'ser'.)
Other Meanings of “misionero”
“misionero” can also mean:
- describing work or spirit related to a mission(B1)
Related Translations
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