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From The Collaborative International Dictionary of English v.0.48:
One \One\ (w[u^]n), a. [OE. one, on, an, AS. [=a]n; akin to D. een, OS. [=e]n, OFries. [=e]n, [=a]n, G. ein, Dan. een, Sw. en, Icel. einn, Goth. ains, W. un, Ir. & Gael. aon, L. unus, earlier oinos, oenos, Gr. o'i`nh the ace on dice; cf. Skr. [=e]ka. The same word as the indefinite article a, an. [root] 299. Cf. 2d A, 1st An, Alone, Anon, Any, None, Nonce, Only, Onion, Unit.] 1. Being a single unit, or entire being or thing, and no more; not multifold; single; individual. [1913 Webster] The dream of Pharaoh is one. --Gen. xli. 25. [1913 Webster] O that we now had here But one ten thousand of those men in England. --Shak. [1913 Webster] 2. Denoting a person or thing conceived or spoken of indefinitely; a certain. "I am the sister of one Claudio" [--Shak.], that is, of a certain man named Claudio. [1913 Webster] 3. Pointing out a contrast, or denoting a particular thing or person different from some other specified; -- used as a correlative adjective, with or without the. [1913 Webster] From the one side of heaven unto the other. --Deut. iv. 32. [1913 Webster] 4. Closely bound together; undivided; united; constituting a whole. [1913 Webster] The church is therefore one, though the members may be many. --Bp. Pearson [1913 Webster] 5. Single in kind; the same; a common. [1913 Webster] One plague was on you all, and on your lords. --1 Sam. vi. 4. [1913 Webster] 6. Single; unmarried. [Obs.] [1913 Webster] Men may counsel a woman to be one. --Chaucer. [1913 Webster] Note: One is often used in forming compound words, the meaning of which is obvious; as, one-armed, one-celled, one-eyed, one-handed, one-hearted, one-horned, one-idead, one-leaved, one-masted, one-ribbed, one-story, one-syllable, one-stringed, one-winged, etc. [1913 Webster] All one, of the same or equal nature, or consequence; all the same; as, he says that it is all one what course you take. --Shak. One day. (a) On a certain day, not definitely specified, referring to time past. [1913 Webster] One day when Phoebe fair, With all her band, was following the chase. --Spenser. [1913 Webster] (b) Referring to future time: At some uncertain day or period in the future; some day. [1913 Webster] Well, I will marry one day. --Shak. [1913 Webster] .
From The Collaborative International Dictionary of English v.0.48:
Day \Day\ (d[=a]), n. [OE. day, dai, dei, AS. d[ae]g; akin to OS., D., Dan., & Sw. dag, G. tag, Icel. dagr, Goth. dags; cf. Skr. dah (for dhagh ?) to burn. [root]69. Cf. Dawn.] 1. The time of light, or interval between one night and the next; the time between sunrise and sunset, or from dawn to darkness; hence, the light; sunshine; -- also called daytime. [1913 Webster +PJC] 2. The period of the earth's revolution on its axis. -- ordinarily divided into twenty-four hours. It is measured by the interval between two successive transits of a celestial body over the same meridian, and takes a specific name from that of the body. Thus, if this is the sun, the day (the interval between two successive transits of the sun's center over the same meridian) is called a solar day; if it is a star, a sidereal day; if it is the moon, a lunar day. See Civil day, Sidereal day, below. [1913 Webster] 3. Those hours, or the daily recurring period, allotted by usage or law for work. [1913 Webster] 4. A specified time or period; time, considered with reference to the existence or prominence of a person or thing; age; time. [1913 Webster] A man who was great among the Hellenes of his day. --Jowett (Thucyd. ) [1913 Webster] If my debtors do not keep their day, . . . I must with patience all the terms attend. --Dryden. [1913 Webster] 5. (Preceded by the) Some day in particular, as some day of contest, some anniversary, etc. [1913 Webster] The field of Agincourt, Fought on the day of Crispin Crispianus. --Shak. [1913 Webster] His name struck fear, his conduct won the day. --Roscommon. [1913 Webster] Note: Day is much used in self-explaining compounds; as, daybreak, daylight, workday, etc. [1913 Webster] Anniversary day. See Anniversary, n. Astronomical day, a period equal to the mean solar day, but beginning at noon instead of at midnight, its twenty-four hours being numbered from 1 to 24; also, the sidereal day, as that most used by astronomers. Born days. See under Born. Canicular days. See Dog day. Civil day, the mean solar day, used in the ordinary reckoning of time, and among most modern nations beginning at mean midnight; its hours are usually numbered in two series, each from 1 to 12. This is the period recognized by courts as constituting a day. The Babylonians and Hindoos began their day at sunrise, the Athenians and Jews at sunset, the ancient Egyptians and Romans at midnight. Day blindness. (Med.) See Nyctalopia. Day by day, or Day after day, daily; every day; continually; without intermission of a day. See under By. "Day by day we magnify thee." --Book of Common Prayer. Days in bank (Eng. Law), certain stated days for the return of writs and the appearance of parties; -- so called because originally peculiar to the Court of Common Bench, or Bench (bank) as it was formerly termed. --Burrill. Day in court, a day for the appearance of parties in a suit. Days of devotion (R. C. Ch.), certain festivals on which devotion leads the faithful to attend mass. --Shipley. Days of grace. See Grace. Days of obligation (R. C. Ch.), festival days when it is obligatory on the faithful to attend Mass. --Shipley. Day owl, (Zool.), an owl that flies by day. See Hawk owl. Day rule (Eng. Law), an order of court (now abolished) allowing a prisoner, under certain circumstances, to go beyond the prison limits for a single day. Day school, one which the pupils attend only in daytime, in distinction from a boarding school. Day sight. (Med.) See Hemeralopia. Day's work (Naut.), the account or reckoning of a ship's course for twenty-four hours, from noon to noon. From day to day, as time passes; in the course of time; as, he improves from day to day. Jewish day, the time between sunset and sunset. Mean solar day (Astron.), the mean or average of all the apparent solar days of the year. One day, One of these days, at an uncertain time, usually of the future, rarely of the past; sooner or later. "Well, niece, I hope to see you one day fitted with a husband." --Shak. Only from day to day, without certainty of continuance; temporarily. --Bacon. Sidereal day, the interval between two successive transits of the first point of Aries over the same meridian. The Sidereal day is 23 h. 56 m. 4.09 s. of mean solar time. To win the day, to gain the victory, to be successful. --S. Butler. Week day, any day of the week except Sunday; a working day. Working day. (a) A day when work may be legally done, in distinction from Sundays and legal holidays. (b) The number of hours, determined by law or custom, during which a workman, hired at a stated price per day, must work to be entitled to a day's pay. [1913 Webster]