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at1

[at; unstressed uh t, it]
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preposition
  1. (used to indicate a point or place occupied in space); in, on, or near: to stand at the door; at the bottom of the barrel.
  2. (used to indicate a location or position, as in time, on a scale, or in order): at zero; at noon; at age 65; at the end; at the lowest point.
  3. (used to indicate presence or location): at home; at hand.
  4. (used to indicate amount, degree, or rate): at great speed; at high altitudes.
  5. (used to indicate a direction, goal, or objective); toward: Aim at the mark. Look at that.
  6. (used to indicate occupation or involvement): at work; at play.
  7. (used to indicate a state or condition): at ease; at peace.
  8. (used to indicate a cause or source): She was annoyed at his stupidity.
  9. (used to indicate a method or manner): He spoke at length.
  10. (used to indicate relative quality or value): at one's best; at cost.
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Idioms
  1. be at (someone), to be sexually aggressive toward (a person): She's pregnant again because he's at her morning, noon, and night.
  2. where it's at, Informal. the place where the most interesting or exciting things happen: Emma says that Rome is definitely where it's at now.
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Origin of at1

before 900; Middle English; Old English æt; cognate with Old Frisian et, Old Norse, Old Saxon, Gothic at, Old High German az, Latin, Old Welsh, Old Breton ad, Greek a- (< a pre-Hellenic IE substratum language), Oscan, Old Irish, Gaulish, Phrygian ad-

where

[hwair, wair]
adverb
  1. in or at what place?: Where is he? Where do you live?
  2. in what position or circumstances?: Where do you stand on this question? Without money, where are you?
  3. in what particular respect, way, etc.?: Where does this affect us?
  4. to what place, point, or end? whither?: Where are you going?
  5. from what source? whence?: Where did you get such a notion?
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conjunction
  1. in or at what place, part, point, etc.: Find where he is. Find where the trouble is.
  2. in or at the place, part, point, etc., in or at which: The book is where you left it.
  3. in a position, case, etc., in which: Where ignorance is bliss, 'tis folly to be wise.
  4. in any place, position, case, etc., in which; wherever: Use the ointment where pain is felt.
  5. to what or whatever place; to the place or any place to which: I will go where you go.
  6. in or at which place; and there: They came to the town, where they lodged for the night.
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pronoun
  1. what place?: Where did you come from?
  2. the place in which; point at which: This is where the boat docks. That was where the phone rang.
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noun
  1. a place; that place in which something is located or occurs: the wheres and hows of job hunting.
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Idioms
  1. where it's at, Slang. where the most exciting, prestigious, or profitable activity or circumstance is to be found.
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Origin of where

before 900; Middle English quher, wher, Old English hwǣr; cognate with Dutch waar, Old High German hwār; akin to Old Norse hvar, Gothic hwar
Can be confusedwe're were wherewhere wherefore (see usage note at the current entry)

Usage note

Whereat ( Where was he at? ) and whereto ( Where is this leading to? ) are often criticized as redundant because neither at nor to adds anything to the meaning of where, and sentences like the preceding ones are perfectly clear and standard without the final at or to. This criticism does not apply to wherefrom, which is fully standard: Where does the money come from? The constructions whereat and whereto occur in the speech of educated people but are rare in formal speech and edited writing.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for where it's at

At

the chemical symbol for
  1. astatine
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symbol for
  1. Also: A ampere-turn
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AT

abbreviation for
  1. attainment target
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at1

preposition
  1. used to indicate location or positionare they at the table?; staying at a small hotel
  2. towards; in the direction oflooking at television; throwing stones at windows
  3. used to indicate position in timecome at three o'clock
  4. engaged in; in a state of (being)children at play; stand at ease; he is at his most charming today
  5. (in expressions concerned with habitual activity) during the passing of (esp in the phrase at night)he used to work at night
  6. for; in exchange forit's selling at four pounds
  7. used to indicate the object of an emotionangry at the driver; shocked at his behaviour
  8. where it's at slang the real place of action
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Word Origin

Old English æt; related to Old Norse at to, Latin ad to

at2

noun plural at
  1. a Laotian monetary unit worth one hundredth of a kip
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Word Origin

from Thai

at3

the internet domain name for
  1. Austria
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where

adverb
    1. in, at, or to what place, point, or position?where are you going?
    2. (used in indirect questions)I don't know where they are
  1. in, at, or to which (place)the hotel where we spent our honeymoon
  2. (subordinating) in the place at whichwhere we live it's always raining
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noun
  1. (usually plural) a question as to the position, direction, or destination of something
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Word Origin

Old English hwǣr, hwār (a); related to Old Frisian hwēr, Old Saxon, Old High German hwār, Old Norse, Gothic hvar

usage

It was formerly considered incorrect to use where as a substitute for in which after a noun which did not refer to a place or position, but this use has now become acceptable: we now have a situation where/in which no further action is needed
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for where it's at

at

prep.

Old English æt, from Proto-Germanic *at (cf. Old Norse, Gothic at, Old Frisian et, Old High German az), from PIE *ad- "to, near, at" (cf. Latin ad "to, toward" Sanskrit adhi "near;" see ad-).

Lost in German and Dutch, which use their equivalent of to; in Scandinavian, however, to has been lost and at fills its place. In choosing between at church, in church, etc. at is properly distinguished from in or on by involving some practical connection; a worshipper is at church; a tourist is in the church.

The colloquial use of at after where ("where it's at") is attested from 1859. At last is recorded from late 13c.; adverbial phrase at least was in use by 1775. At in Middle English was used freely with prepositions (e.g. at after, which is in Shakespeare), but this has faded with the exception of at about, which was used in modern times by Trollope, Virginia Woolfe, D.H. Lawrence, and Evelyn Waugh, but nonetheless is regarded as a sign of incompetent writing by my copy editor bosses.

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where

adv.

Old English hwær, hwar, from Proto-Germanic *khwar (cf. Old Saxon hwar, Old Norse hvar, Old Frisian hwer, Middle Dutch waer, Old High German hwar, German wo, Gothic hvar "where"), from PIE interrogative base *qwo- (see who).

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Online Etymology Dictionary, © 2010 Douglas Harper

where it's at in Medicine

At

  1. The symbol for the elementastatine

where it's at in Science

At


Idioms and Phrases with where it's at

where it's at

where

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.