How to Say "deviation" in Spanish
The Spanish word for “deviation” is “desviación” — B1 level. This is a very common word in everyday Spanish.

Examples
Cualquier desviación del plan original debe ser aprobada.
Any deviation from the original plan must be approved.
La brújula tiene una pequeña desviación hacia el oeste.
The compass has a small deviation to the west.
Hubo una desviación en la carretera debido a las obras.
There was a detour on the road due to construction works.
Identifying Feminine Nouns
In Spanish, almost all words ending in '-ción' are feminine. You should always use 'la' or 'una' with this word: 'la desviación'.
Desviación vs. Desvío
While similar, 'desviación' is often used for abstract ideas or scientific data, while 'desvío' is used more often for physical road detours.
Confusing Gender
Mistake: “el desviación”
Correction: la desviación. Words ending in -ción are always feminine!
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