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at

 - 32 dictionary results
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at

1  [at; unstressed uht, it]
Use at in a Sentence
–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.
—Idioms
11. be at (someone), to be sexually aggressive toward (a person): She's pregnant again because he's at her morning, noon, and night.
12. 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.
Origin:
bef. 900; ME; OE æt; c. OFris et, ON, OS, Goth at, OHG az, L, Old Welsh, Old Breton ad, Gk a- (< a pre-Hellenic IE substratum language), Oscan, OIr, Gaulish, Phrygian ad-
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at

2  [aht, at]
–noun
a money of account of Laos, the 100th part of a kip.
Origin:
1950–55; < Lao; cf. Thai ʔàt formerly, a copper coin worth one eighth of a füang, ult. < Pali aṭṭha eight

at-

 
var. of ad- before t: attend.

AT

 
1. achievement test.
2. antitank.

At

 
ampere-turn.

aT

 
attotesla.

At

 
Symbol, Chemistry.
astatine.

at.

 
1. atmosphere.
2. atomic.
3. attorney.

A.T.

 
Atlantic time.

am⋅pere-turn

  [am-peer-turn, am-peer-]
–noun Electricity.
1. one complete convolution of a conducting coil, through which one ampere of current passes.
2. the magnetomotive force produced by one ampere passing through one complete turn or convolution of a coil. Abbreviation: At
Origin:
1880–85

at⋅to⋅tes⋅la

  [at-oh-tes-luh]
–noun
one-quintillionth (10-18) of a tesla. Abbreviation: aT
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To at
am·pere-turn   (ām'pîr-tûrn')
n.   Abbr. At
A unit of magnetomotive force in the meter-kilogram-second system equal to the magnetomotive force around a path linking one turn of a conducting loop carrying a current of one ampere.
as·ta·tine   (ās'tə-tēn', -tĭn)   
n.   Symbol At
A highly unstable radioactive element, the heaviest of the halogen series, that resembles iodine in solution. Its longest lived isotope has a mass number of 210 and has a half-life of 8.3 hours. Atomic number 85; melting point 302°C; boiling point 337°C; valence probably 1, 3, 5, 7. See Table at element.

[Greek astatos, unstable; see astasia + -ine2.]
at 1   (āt; ət when unstressed)   
prep.  

    1. In or near the area occupied by; in or near the location of: at the market; at our destination.

    2. In or near the position of: always at my side; at the center of the page.

  2. To or toward the direction or location of, especially for a specific purpose: Questions came at us from all sides.

  3. Present during; attending: at the dance.

  4. Within the interval or span of: at the dinner hour; at a glance.

  5. In the state or condition of: at peace with one's conscience.

  6. In the activity or field of: skilled at playing chess; good at math.

  7. To or using the rate, extent, or amount of; to the point of: at 30 cents a pound; at high speed; at 20 paces; at 350°F.

  8. On, near, or by the time or age of: at three o'clock; at 72 years of age.

  9. On account of; because of: rejoice at a victory.

  10. By way of; through: exited at the rear gate.

  11. In accord with; following: at my request.

  12. Dependent upon: at the mercy of the court.

  13. Occupied with: at work.


[Middle English, from Old English æt; see ad- in Indo-European roots.]
at 2   (ät)   
n.   pl. at
See Table at currency.

[Lao àt, perhaps from Thai àt, former coin worth one-eighth of a füang (a former unit of currency), ultimately from Pali aṭṭa, eight, from Sanskrit aṣṭā; see oktō(u)- in Indo-European roots.]
aT  
abbr.  attotesla
At 1  
The symbol for the element astatine.
At 2  
abbr.  ampere-turn
AT  
abbr.  

  1. air temperature

  2. also a/t antitank

  3. automatic transmission

at·to·tes·la   (āt'ō-těs'lə)   
n.   Abbr. aT
One-quintillionth (10-18) of a tesla.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Medical Dictionary

Main Entry: at
Function: abbreviation
airtight

Main Entry: At
Function: symbol
astatine
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
Cite This Source
Medical Dictionary

At
The symbol for the element astatine.

at- pref.
Variant of ad-.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
Science Dictionary
astatine   (ās'tə-tēn')  Pronunciation Key 
Symbol At
A highly unstable, rare, radioactive element that is the heaviest of the halogen elements. Its most stable isotope has a half-life of 8.3 hours. Atomic number 85; melting point 302°C; boiling point 337°C; valence probably 1, 3, 5, 7. See Periodic Table.
At  
The symbol for astatine.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Computing Dictionary

AT
IBM PC AT

at
1. commercial at.
2. The country code for Austria.

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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Abbreviations & Acronyms
aT
attotesla
At

  1. ampere-turn

  2. astatine

AT

  1. achievement test

  2. advanced technology

  3. air temperature

  4. antitank

  5. Atlantic Time

  6. automatic transmission

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

At

radioactive chemical element and the heaviest member of the halogen elements, or Group 17 (Group VIIa) of the periodic table. Astatine, which has no stable isotopes, was first synthetically produced (1940) at the University of California by American physicists Dale R. Corson, Kenneth R. MacKenzie, and Emilio Segre, who bombarded bismuth with accelerated alpha particles (helium nuclei) to yield astatine and neutrons. Naturally occurring astatine isotopes have subsequently been found in minute amounts in the three natural radioactive decay series, in which they occur by minor branching (astatine-218 in the uranium series, astatine-216 in the thorium series, and astatine-215 and astatine-219 in the actinium series). Thirty-three isotopes are known; astatine-210, with a half-life of 8.3 hours, is the longest lived.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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