As
Middle English: reduced form of Old English alswā ‘similarly’ (see also).
wiktionary
From Middle English as, als(a), alswa, from Old English eallswā(“just so; as”), thus representing a reduced form of also. Compare German Low German as, German als, Dutch als.
Borrowed from Latin as. Doublet of ace.
a + -s.
Shortening of as hell or as fuck.
etymonline
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.
