Real Dictionary

A.S. in American English
abbreviation: Associate in Science

as conjunction and preposition uses
conjunction: If something happens as something else happens, it happens at the same time.
phrase: You use the structure as...as when you are comparing things.

AS in American English
American Samoa
arsenic
abbreviation: American Samoa (approved esp. for use with zip code)
the chemical symbol for

as in American English 1
to the same amount or degree; equally
adverb: to the same degree, amount, or extent; similarly; equally

as in American English 2
an ancient Roman unit of weight, equal to about twelve ounces; libra, or Roman pound
noun: a copper coin and early monetary unit of ancient Rome, originally having a nominal weight of a pound of 12 ounces: discontinued c80 b.c.

As in British English
abbreviation for: Anglo-Saxon
symbol for: arsenic

as in British English 1
used correlatively before an adjective or adverb and before a noun phrase or a clause to indicate identity of extent, amount, etc
while; when; at the time that
preposition: in the role of; being

as in British English 2
noun: an ancient Roman unit of weight approximately equal to 1 pound troy (373 grams)

as in British English 3
the internet domain name for: American Samoa

as- in American English
ad-
combining form

AS. in American English
abbreviation: Anglo-Saxon