Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun   At the rate of; 
per . - noun computing  The symbol used as a 
separator between ausername and adomain name in an e-mail address ("at" the domain name). - noun computing, IRC  The most common choice of configurable 
prefix symbol to identify achannel operator . - noun Internet  Prepended to the name of the 
user to whom a remark is addressed. - preposition   
at a rate of (so much each) - preposition informal, neologism  
at (any sense) - preposition text messaging Replacing the sounding /æt/ on any word that has this pronunciation or similar.
 
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
A cursive variation of ᾱ or ᾱᾱ, the abbreviation of Greek ανα (ana) used in recipes and prescriptions with the meaning "of each", and later extended to accounting. (Other explanations have that it is ā, an abbreviation of Latin ad ("to"), or French à ("to").)
			
		
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Examples
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sionnach commented on the word @
The @, or arroba: a traditional unit of weight in Spain and Portugal, equal to 1/4 quintal. However, the Spanish and Portuguese quintals are of different sizes. In Spain, the arroba equals 25.36 pounds (11.50 kilograms); arrobas of very similar sizes were established in the Spanish speaking countries of Latin America. In Portugal and Brazil, the arroba traditionally equals 32.38 pounds (14.69 kilograms, but in recent years this has been "metrized" to be exactly 15 kilograms). The arroba has also been used as a metric unit equal to exactly 15 kilograms. The name of the unit comes from ar rub', Arabic for "the quarter." The @ sign has been used in Spanish as a symbol for the arroba since the sixteenth century at least.
January 20, 2008
			
		
	
asativum commented on the word @
You're saying, then, that that @, from the Arab ar rub', is a quarter quintal?
January 21, 2008
			
		
	
sionnach commented on the word @
Yes. Though there is a fair amount of variation in the definition of a quintal - there were regional variations (between countries) back in the 'olden days' (note deliberate vagueness); nowadays there seems to be a metric version as well, generally bigger than the traditional one.
arroba is, of course, also just Spanish for the @ sign.
January 21, 2008
			
		
	
asativum commented on the word @
Fascinating; thanks!
January 21, 2008
			
		
	
valse commented on the word @
arobase in French, see le petit escargot
March 22, 2009
			
		
	
alexz commented on the word @
BBC magazine just had an article of the history of the at sign.
http://www.bbc.com/news/magazine-35744456
March 8, 2016