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

Examples
Mi misión es ayudar a los demás.
My mission is to help others.
La misión espacial duró tres meses.
The space mission lasted three months.
Los sacerdotes fueron a la misión en América.
The priests went to the mission in the Americas.
Gender: Always Feminine
'Misión' is always feminine, even when referring to a group of men: 'la misión', 'esa misión difícil'. Use 'el' is NEVER correct.
Plural Form
The plural is 'misiones'. Example: 'Tenemos tres misiones por completar' (We have three missions to complete).
Using 'el' instead of 'la'
Mistake: “el misión”
Correction: la misión - 'misión' is ALWAYS feminine. Remember: la + misión = la misión.
Confusing with English 'mission' usage
Mistake: “Using 'misión' for every English 'mission'”
Correction: In English, 'mission' can mean a church or restaurant. In Spanish, use 'iglesia', 'misión' (religious), or 'restaurante' instead.
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