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"Per week" is a phrase which is often translated as "semanal", and "a week" is a phrase which is often translated as "una semana". Learn more about the difference between "per week" and "a week" below.
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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)