of

1 [uhv, ov; unstressed uhv or, esp. before consonants, uh]
preposition
1.
(used to indicate distance or direction from, separation, deprivation, etc.): within a mile of the church; south of Omaha; to be robbed of one's money.
2.
(used to indicate derivation, origin, or source): a man of good family; the plays of Shakespeare; a piece of cake.
3.
(used to indicate cause, motive, occasion, or reason): to die of hunger.
4.
(used to indicate material, component parts, substance, or contents): a dress of silk; an apartment of three rooms; a book of poems; a package of cheese.
5.
(used to indicate apposition or identity): Is that idiot of a salesman calling again?
6.
(used to indicate specific identity or a particular item within a category): the city of Chicago; thoughts of love.
7.
(used to indicate possession, connection, or association): the king of France; the property of the church.
8.
(used to indicate inclusion in a number, class, or whole): one of us.
9.
(used to indicate the objective relation, the object of the action noted by the preceding noun or the application of a verb or adjective): the ringing of bells; He writes her of home; I'm tired of working.
10.
(used to indicate reference or respect): There is talk of peace.
11.
(used to indicate qualities or attributes): an ambassador of remarkable tact.
12.
(used to indicate a specified time): They arrived of an evening.
13.
Chiefly Northern U.S. before the hour of; until: twenty minutes of five.
14.
on the part of: It was very mean of you to laugh at me.
15.
in respect to: fleet of foot.
16.
set aside for or devoted to: a minute of prayer.
17.
Archaic. by: consumed of worms.

Origin:
before 900; Middle English, Old English: of, off; cognate with German ab, Latin ab, Greek apó. See off, a-2, o'


Of is sometimes added to phrases beginning with the adverb how or too followed by a descriptive adjective: How long of a drive will it be? It's too hot of a day for tennis. This construction is probably modeled on that in which how or too is followed by much, an unquestionably standard use in all varieties of speech and writing: How much of a problem will that cause the government? There was too much of an uproar for the speaker to be heard. The use of of with descriptive adjectives after how or too is largely restricted to informal speech. It occurs occasionally in informal writing and written representations of speech. See also couple, off.
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of

2 [uhv]
auxiliary verb Pronunciation spelling.
have: He should of asked me first.
Compare a4.

Because the preposition of, when unstressed (a piece of cake), and the unstressed or contracted auxiliary verb have (could have gone, could've gone) are both pronounced or in connected speech, inexperienced writers commonly confuse the two words, spelling have as of (I would of handed in my book report, but the dog ate it). Professional writers have been able to exploit this spelling deliberately, especially in fiction, to help represent the speech of the uneducated: If he could of went home, he would of.

of-

variant of ob- (by assimilation) before f: offend.

OF

Old French.
Also, OF, O.F.
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World English Dictionary
of (ɒv, (unstressed) əv)
 
prep
1.  used with a verbal noun or gerund to link it with a following noun that is either the subject or the object of the verb embedded in the gerund: the breathing of a fine swimmer (subject); the breathing of clean air (object)
2.  used to indicate possession, origin, or association: the house of my sister; to die of hunger
3.  used after words or phrases expressing quantities: a pint of milk
4.  constituted by, containing, or characterized by: a family of idiots; a rod of iron; a man of some depth
5.  used to indicate separation, as in time or space: within a mile of the town; within ten minutes of the beginning of the concert
6.  used to mark apposition: the city of Naples; a speech on the subject of archaeology
7.  about; concerning: speak to me of love
8.  used in passive constructions to indicate the agent: he was beloved of all
9.  informal used to indicate a day or part of a period of time when some activity habitually occurs: I go to the pub of an evening
10.  (US) before the hour of: a quarter of nine
 

OF
 
abbreviation for
Old French (language)

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

of
O.E. of, unstressed form of æf (prep., adv.) "away, away from," from P.Gmc. *af- (cf. O.N. af, O.Fris. af, of "of," Du. af "off, down," Ger. ab "off, from, down"), from PIE *apo- "off, away" (see apo-). Primary sense in O.E. was still "away," but shifted in M.E. with use
of the word to translate L. de, ex, and especially O.Fr. de, which had come to be the substitute for the genitive case. "Of shares with another word of the same length, as, the evil glory of being accessory to more crimes against grammar than any other." [Fowler]
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
OF
  1. Oriental female

  2. outfield

  3. outfielder

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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