"Diez" is an adjective which is often translated as "ten", and "es la una" is a phrase which is often translated as "it's one o'clock". Learn more about the difference between "diez" and "es la una" below.
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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).