"Dentista" is a noun which is often translated as "dentist", and "semana" is a noun which is often translated as "week". Learn more about the difference between "dentista" and "semana" below.
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This means that the noun can be masculine or feminine, depending on the gender of person it refers to (e.g. el doctor, la doctora).
El dentista me sacó la muela del juicio.The dentist took out my wisdom tooth.
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A feminine noun is almost always used with feminine articles and adjectives (e.g. la mujer bonita, la luna llena).
1. (period of time)
No estoy libre para cenar hasta la semana que viene.I'm not free for dinner until next week.