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"Ya que" is a phrase which is often translated as "since", and "a medida que" is a conjunction which is often translated as "as". Learn more about the difference between "ya que" and "a medida que" below.
ya que()
A phrase is a group of words commonly used together (e.g., once upon a time).
1. (because)
a medida que()
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g., The cat and the dog slept.).