early in the day

early Adjective

— If something is early, it happens in the first part of a time period. He didn't like going to the early classes.

early Adverb

— During the first part of a time period. She got up early in the morning.

in Preposition

— Used to show that something is inside something else. The cat is in the box. — Used to show that someone is at home, or is available. Is John in? The Doctor is now in. — Used to show movement towards the inside. The rain came in through the window.

the Determiner

— Used, instead of a, to reference something specific, already known to exist. Compare "I read a book." and "I read the book." — Used with a stress, to show that the word following is special. Are you the John Smith that I went to school with? — Used with an adjective that acts like a noun to mean all of the people concerned The poor are always with us. — Used with superlatives forms of adjectives and adverbs. You are the best.

day Noun

— A day is a measure of time. — 24 hours — Seven days make one week — The time between midnight and the following midnight (or between sunset and sunset in Jewish reckoning) — The time between sunrise and sunset, when it is daylight — The part of a day spent at work or school He spent two days at work means that on two days he went to work; he did not spend 48 hours at work.