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as (adv., conj., pron.)

c. 1200, worn-down form of Old English alswa "quite so, wholly so," literally "all so" (see also), fully established by c. 1400. Equivalent to so; any distinction in use is purely idiomatic. Related to German als "as, than," from Middle High German also.

Phrase as well "just as much" is recorded from late 15c.; the phrase also can imply "as well as not," "as well as anything else." Phrase as if, in Kantian metaphysics (translating German als ob), introducing a supposition not to be taken literally, is from 1892; as an interjection of incredulity (as if!; i.e. "as if that really could happen") is attested from 1995. It duplicates Latin quasi. Phrase as it were "as if it were so" is attested from late 14c.

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Definitions of as
1
as (n.)
a United States territory on the eastern part of the island of Samoa;
Synonyms: American Samoa / Eastern Samoa
2
as (adv.)
to the same degree (often followed by `as');
he is every bit as mean as she is
birds were singing and the child sang as sweetly
sang as sweetly as a nightingale
Synonyms: equally / every bit
3
As (n.)
a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar;
Synonyms: arsenic / atomic number "
From wordnet.princeton.edu