composed of molecules that move freely among themselves but do not tend to separate like those of gases; neither gaseous nor solid.
of, pertaining to, or consisting of liquids: a liquid diet.
flowing like water.
clear, transparent, or bright: liquid eyes.
(of sounds, tones, etc.) smooth; agreeable; flowing freely: the liquid voice of a trained orator.
in cash or readily convertible into cash without significant loss of principal: liquid assets.
Phonetics. characterizing a frictionless speech sound pronounced with only a partial obstruction of the breath stream and whose utterance can be prolonged as that of a vowel, especially l and r.
(of movements, gestures, etc.) graceful; smooth; free and unconstricted: the ballerina's liquid arabesques.
a liquid substance.
Phonetics. either r or l, and sometimes m, n, ng.

1350–1400; Middle English liquyd < Latin liquidus, equivalent to liqu(ēre) to be liquid + -idus -id4

liquidly, adverb
liquidness, noun
nonliquid, adjective, noun
nonliquidly, adverb
unliquid, adjective

fluid, gas, liquid (see synonym study at the current entry).

1. Liquid, fluid agree in referring to matter that is not solid. Liquid commonly refers to substances, as water, oil, alcohol, and the like, that are neither solids nor gases: Water ceases to be a liquid when it is frozen or turned to steam. Fluid is applied to anything that flows, whether liquid or gaseous: Pipes can carry fluids from place to place. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
liquid (ˈlɪkwɪd)
1.  gas Compare solid a substance in a physical state in which it does not resist change of shape but does resist change of size
2.  a substance that is a liquid at room temperature and atmospheric pressure
3.  phonetics a frictionless continuant, esp () or ()
4.  of, concerned with, or being a liquid or having the characteristic state of liquids: liquid wax
5.  shining, transparent, or brilliant
6.  flowing, fluent, or smooth
7.  (of assets) in the form of money or easily convertible into money
[C14: via Old French from Latin liquidus, from liquēre to be fluid]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., from O.Fr. liquide, from L. liquidus "fluid, liquid, moist," from liquere "be fluid," related to liqui "to melt, flow." Of sounds, from 1630s. Financial sense of "capable of being converted to cash" is first recorded 1818. The noun is 1709, from the adjective.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

liquid liq·uid (lĭk'wĭd)

  1. The state of matter in which a substance exhibits a characteristic readiness to flow, little or no tendency to disperse, and relatively high incompressibility.

  2. Matter or a specific body of matter in this state.

  1. Of or being a liquid.

  2. Having been liquefied, especially melted by heating or condensed by cooling.

  3. Flowing readily; fluid.

liq'uid·ly adv.
liq'uid·ness n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
liquid   (lĭk'wĭd)  Pronunciation Key 
One of four main states of matter, composed of molecules that can move about in a substance but are bound loosely together by intramolecular forces. Unlike a solid, a liquid has no fixed shape, but instead has a characteristic readiness to flow and therefore takes on the shape of any container. Because pressure transmitted at one point is passed on to other points, a liquid usually has a volume that remains constant or changes only slightly under pressure, unlike a gas.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

liquid definition

A phase of matter in which atoms or molecules can move freely while remaining in contact with one another. A liquid takes the shape of its container. (Compare gas and solid.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
He worked a hand pump on the inside and leaned his head out to make sure the
  liquid gold was flowing.
Two mirrors, some paint, and liquid silver leaf were all that was needed to
  bring some style to this side table.
Julia waters them through the growing season and feeds them with liquid
  fertilizer every other week.
Add specified liquid and other seasonings, cover, and bring to a boil over high
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