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"A week" is a phrase which is often translated as "una semana", and "per week" is a phrase which is often translated as "semanal". Learn more about the difference between "a week" and "per week" below.
a week
A phrase is a group of words commonly used together (e.g., once upon a time).
a. una semana
After seeing a shooting star for the third time in a week, he figured his luck was bound to change.Tras ver una estrella fugaz por tercera vez en una semana, tuvo la certeza de que su suerte iba a cambiar.
2. (every week)
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