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"El" is a form of "el", a definite article which is often translated as "the". "Siete" is an adjective which is often translated as "seven". Learn more about the difference between "siete" and "el" below.
siete(
syeh
-
teh
)An adjective is a word that describes a noun (e.g., the big dog).
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
el(
ehl
)A definite article is a word that identifies a noun as specific or known to the speaker (e.g., the girl).