(dā) noun
1. The period from dawn to dark; hence, daylight or sunlight.
2. The interval represented by one revolution of the earth upon its axis; twenty-four hours; also, this period as a unit in computing time. ◆ Collateral adjective: diurnal. See under TIME.
3. The hours appointed for labor.
4. A day's journey.
5. The period of rotation about its axis of any heavenly body.
6. A time or period; an age.
7. A contest or battle, or its result: The liberals won the day.
8. A specified epoch: in Caesar's day.
9. A specified date: Independence Day.
—day after day Every day.
—day by day Each day.
—day in, day out Every day.
—(from) day to day From one day to the next; not long-range.
—the day Scot. Today: How are ye the day? [OE dœg]

(dā), Edmund Ezra,
1883–1951, U.S. educator; president of Cornell University 1937–49.
—Thomas,
1748–89, English author.
—William Rufus,
1849–1923, U.S. statesman and jurist.