Antonym: night. Similar words: day after day, by day, all day, one day, today, the other day, yesterday, night and day. Meaning: [deɪ] 
n. 1. time for Earth to make a complete rotation on its axis 2. some point or period in time 3. the time after sunrise and before sunset while it is light outside 4. a day assigned to a particular purpose or observance 5. the recurring hours when you are not sleeping (especially those when you are working) 6. an era of existence or influence 7. a period of opportunity 8. the period of time taken by a particular planet (e.g. Mars) to make a complete rotation on its axis 9. the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day 10. United States writer best known for his autobiographical works (1874-1935).
n. 1. time for Earth to make a complete rotation on its axis 2. some point or period in time 3. the time after sunrise and before sunset while it is light outside 4. a day assigned to a particular purpose or observance 5. the recurring hours when you are not sleeping (especially those when you are working) 6. an era of existence or influence 7. a period of opportunity 8. the period of time taken by a particular planet (e.g. Mars) to make a complete rotation on its axis 9. the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day 10. United States writer best known for his autobiographical works (1874-1935). 
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1, What's done by night appears by day. 
2, Rome was not built in a (or one) day.
3, Prepare for a rain day.
4, Every dog has his day.
5, Save money against a rainy day.
6, Rome wasn't built in a day.
7, The day has eyes, the night has ears.
8, Fair and softly go far in a day.
9, Do not praise a day before sunset.
10, Carpe diem (Pluck the day; Seize the day).
11, Each day brings its own bread.
12, What is done by night appears by day.
13, You cannot have two forenoons in the same day.
14, The morning sun never lasts a day.
15, And a child that's born on the Sabbath day.
16, In the evening one may praise the day.
17, A day is a miniature of eternity.
18, An apple a day keeps the doctor away.
19, The longest day must have an end.
20, Childhood shows the man,(http://sentencedict.com/day .html) as morning shows the day.
21, The day is short but the work is much.
22, The longest day has an end.
23, The better the day, the better the deed.
24, Rome was not built in a day.
25, Sufficient for the day is the evil thereof.
26, Every day of thy life is a leaf in thy history.
27, Seize the present day, trusting the morrow as little as may be.
28, A man has his hour, and a dog has his day.
29, For age and want save while you may; no morning sun lasts a whole day.
30, An evening red and a morning grey, is a sign of a fair day.
More similar words: day after day, by day, all day, one day, today, the other day, yesterday, night and day, day and night.