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QUICK ANSWER
"Año" is a form of "año", a noun which is often translated as "year". "Dentro de" is a preposition which is often translated as "inside". Learn more about the difference between "dentro de" and "año" below.
dentro de(
dehn
-
troh
deh
)A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).
2. (time limit)
el año(
ah
-
nyoh
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
2. (of school)
a. grade
Si fallo el examen, tendré que repetir el año.If I fail this test, I will have to repeat the grade.
