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"Unto" is a preposition which is often translated as "a", and "upon" is a preposition which is often translated as "en". Learn more about the difference between "unto" and "upon" below.
unto(
uhn
-
tu
)A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).
upon(
uh
-
pan
)A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).