at

¹at

preposition \ət, ˈat\

Definition of AT

1

—used as a function word to indicate presence or occurrence in, on, or near <staying at a hotel> <at a party> <sick at heart>

2

—used as a function word to indicate the goal of an indicated or implied action or motion <aim at the target> <creditors are at him again>

3

—used as a function word to indicate that with which one is occupied or employed <at work> <at the controls> <good at chess>

4

—used as a function word to indicate situation in an active or passive state or condition <at liberty> <at rest>

5

—used as a function word to indicate the means, cause, or manner <sold at auction> <laughed at my joke> <act at your own discretion>

6

a —used as a function word to indicate the rate, degree, or position in a scale or series <the temperature at 90> <at first>

b —used as a function word to indicate age or position in time <will retire at 65>

Origin of AT

Middle English, from Old English æt; akin to Old High German az at, Latin ad

First Known Use: before 12th century

²at

noun \ˈät\

plural at also att

Definition of AT

: a monetary subunit of the kip — see kip at money table

Variants of AT

at also att \ˈät\

Origin of AT

Lao

First Known Use: 1955

³at

abbreviation

Definition of AT

1

airtight

2

atmosphere

3

atomic

At

symbol

Definition of AT

astatine

Other Chemical Engineering Terms

alkali, cation, decant, hygroscopic, isotope, oxidize, slurry, solute, viscous

AT

abbreviation

Definition of AT

1

air temperature

2

ampere-turn

3

automatic transmission

Other Climate/Meteorology Terms

monsoon, occlusion, ozone, rime, squall, zephyr

at

abbreviation    (Medical Dictionary)

Medical Definition of AT

airtight