• synonyms


Lyrics We Totally Didn’t Get As KidsRead more in this article about some frequently asked questions and fun facts related to our definitions.


since, being, equally, like, now, cause, comparatively, essentially, similarly, considering, for, whereas

Nearby words

arytenoid muscle, arytenoidectomy, arytenoiditis, arytenoidopexy, arête, as, as . . . as, as a matter of course, as a matter of fact, as a rule, as a whole


Origin of as

before 1000; Middle English as, als, alse, also, Old English alswā, ealswā all so (see also), quite so, quite as, as; cognate with Middle Dutch alse (Dutch als), Old High German alsō (Middle High German álsō, álse, als, German also so, als as, as if, because)

Synonym study

8. See because.

Usage note

As a conjunction, one sense of as is “because”: As she was bored, Sue left the room. As also has an equally common use in the sense “while, when”: As the parade passed by, the crowd cheered and applauded. These two senses sometimes result in ambiguity: As the gates were closed, he walked away. (When? Because?)
Asas is standard in both positive and negative constructions: The fleet was as widely scattered then as it had been at the start of the conflict. Foreign service is not as attractive as it once was. Soas is sometimes used in negative constructions (… not so attractive as it once was ) and in questions ( “What is so rare as a day in June?” ).
The phrase as far as generally introduces a clause: As far as money is concerned, the council has exhausted all its resources. In some informal speech and writing, as far as is treated as a preposition and followed only by an object: As far as money, the council has exhausted all its resources.
As to as a compound preposition has long been standard though occasionally criticized as a vague substitute for about, of, on, or concerning: We were undecided as to our destination. As to sometimes occurs at the beginning of a sentence, where it introduces an element that would otherwise have less emphasis: As to his salary, that too will be reviewed. As to what and as to whether are sometimes considered redundant but have long been standard: an argument as to what department was responsible. See also all, farther, like1, so1.

Definition for as (2 of 9)


[ as ]
/ æs /

noun, plural as·ses [as-iz] /ˈæs ɪz/.

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.
a unit of weight equal to 12 ounces.

Origin of as

Borrowed into English from Latin around 1595–1605

Definition for as (3 of 9)


Symbol, Chemistry.

Definition for as (4 of 9)


American Samoa (approved especially for use with zip code).

Definition for as (5 of 9)

A, a

[ ey ]
/ eɪ /

noun, plural A's or As, a's or as.

the first letter of the English alphabet, a vowel.
any spoken sound represented by the letter A or a, as in bake, hat, father, or small.
something having the shape of an A.
a written or printed representation of the letter A or a.
a device, as a printer's type, for reproducing the letter A or a.

Definition for as (6 of 9)


variant of ad- before s: assert.

Definition for as (7 of 9)

Definition for as (8 of 9)


Associate in Science.

Definition for as (9 of 9) Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for as (1 of 5)


/ (æz, unstressed əz) /

conjunction (subordinating)

adverb, conjunction

  1. used correlatively before an adjective or adverb and before a noun phrase or a clause to indicate identity of extent, amount, etcshe is as heavy as her sister; she is as heavy now as she used to be
  2. used with this sense after a noun phrase introduced by the sameshe is the same height as her sister


Word Origin for as

Old English alswā likewise; see also


British Dictionary definitions for as (2 of 5)


/ (æs) /


an ancient Roman unit of weight approximately equal to 1 pound troy (373 grams)
the standard monetary unit and copper coin of ancient Rome

Word Origin for as

C17: from Latin ās unity, probably of Etruscan origin

British Dictionary definitions for as (3 of 5)



the internet domain name for

American Samoa

British Dictionary definitions for as (4 of 5)


symbol for

chem arsenic

British Dictionary definitions for as (5 of 5)


abbreviation for

Also: A.S. Anglo-Saxon
Australian Standards
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for as



c.1200, worn-down form of Old English alswa "quite 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." Interjection of incredulity as if! (i.e. "as if that really could happen") is attested from 1995, an exact duplication of Latin quasi.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for as (1 of 3)


The symbol for the elementarsenic

Medicine definitions for as (2 of 3)



aortic stenosis
auris sinistra (left ear)

Medicine definitions for as (3 of 3)



Variant ofad-
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for as (1 of 3)


The symbol for arsenic.

Science definitions for as (2 of 3)


Abbreviation of adenine, ampere, angstrom, area

Science definitions for as (3 of 3)


[ ärsə-nĭk ]


A metalloid element most commonly occurring as a gray crystal, but also found as a yellow crystal and in other forms. Arsenic and its compounds are highly poisonous and are used to make insecticides, weed killers, and various alloys. Atomic number 33; atomic weight 74.922; valence 3, 5. Gray arsenic melts at 817°C (at 28 atm pressure), sublimes at 613°C, and has a specific gravity of 5.73. See Periodic Table.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.