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