at
preposition
[ at ]
• expressing location or arrival in a particular place or position.
• "they live at Conway House"
• expressing the time when an event takes place.
• "the children go to bed at nine o'clock"
• denoting a particular point or level on a scale.
• "prices start at £18,500"
• expressing a particular state or condition.
• "his ready smile put her at ease"
• expressing the object of a look, thought, action, or plan.
• "I looked at my watch"
• expressing the means by which something is done.
• "holding a prison officer at knifepoint"
Origin:
Old English æt, of Germanic origin; related to Old Frisian et and Old Norse at, from an Indo-European root shared by Latin ad ‘to’.
at
noun
• a monetary unit of Laos, equal to one hundredth of a kip.
Origin:
Thai.
at-
prefix
• variant spelling of ad- assimilated before t (as in attend, attenuate ).
At
symbol
• the chemical element astatine.
astatine
noun
• the chemical element of atomic number 85, a radioactive member of the halogen group. Astatine was first produced by bombarding bismuth with alpha particles, and it occurs in traces in nature as a decay product.
Origin:
1940s: from Greek astatos ‘unstable’ + -ine4.
