noun, plural qualities.
an essential or distinctive characteristic, property, or attribute: the chemical qualities of alcohol.
character or nature, as belonging to or distinguishing a thing: the quality of a sound.
character with respect to fineness, or grade of excellence: food of poor quality; silks of fine quality.
high grade; superiority; excellence: wood grain of quality.
a personality or character trait: kindness is one of her many good qualities.
native excellence or superiority.
an accomplishment or attainment.
good or high social position: a man of quality.
the superiority or distinction associated with high social position.
Acoustics. the texture of a tone, dependent on its overtone content, that distinguishes it from others of the same pitch and loudness.
Phonetics. the tonal color, or timbre, that characterizes a particular vowel sound.
Logic. the character of a proposition as affirmative or negative.
Thermodynamics. the proportion or percentage of vapor in a mixture of liquid and vapor, as wet steam.
social status or position.
a person of high social position: He's quality, that one is.
of or having superior quality: quality paper.
producing or providing products or services of high quality or merit: a quality publisher.
of or occupying high social status: a quality family.
marked by a concentrated expenditure of involvement, concern, or commitment: Counselors are urging that working parents try to spend more quality time with their children.

1250–1300; Middle English qualite < Old French < Latin quālitās, equivalent to quāl(is) of what sort + -itās -ity

qualityless, adjective
nonquality, noun, plural nonqualities.
subquality, noun, plural subqualities.

1. trait, character, feature. Quality, attribute, property agree in meaning a particular characteristic (of a person or thing). A quality is a characteristic, innate or acquired, that, in some particular, determines the nature and behavior of a person or thing: naturalness as a quality; the quality of meat. An attribute was originally a quality attributed, usually to a person or something personified; more recently it has meant a fundamental or innate characteristic: an attribute of God; attributes of a logical mind. Property applies only to things; it means a characteristic belonging specifically in the constitution of, or found (invariably) in, the behavior of a thing: physical properties of uranium or of limestone. 3. nature, kind, grade, sort, condition.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
quality (ˈkwɒlɪtɪ)
n , pl -ties
1.  a distinguishing characteristic, property, or attribute
2.  the basic character or nature of something
3.  a trait or feature of personality
4.  degree or standard of excellence, esp a high standard
5.  (formerly) high social status or the distinction associated with it
6.  musical tone colour; timbre
7.  logic the characteristic of a proposition that is dependent on whether it is affirmative or negative
8.  phonetics the distinctive character of a vowel, determined by the configuration of the mouth, tongue, etc, when it is articulated and distinguished from the pitch and stress with which it is uttered
9.  (modifier) having or showing excellence or superiority: a quality product
[C13: from Old French qualité, from Latin quālitās state, nature, from quālis of what sort]

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 13c., from O.Fr. qualite (12c., Fr. qualité), from L. qualitatem (nom. qualitas; said to have been coined by Cicero to translate Gk. poiotes), from qualis "of what sort," from PIE pronomial base *kwo- (see qua). Noun phrase quality time first recorded 1977. Quality
of life is from 1943. Quality control first attested 1935.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

quality definition

The totality of features and characteristics of a product or service that bear on its ability to satisfy stated or implied needs. Not to be mistaken for "degree of excellence" or "fitness for use" which meet only part of the definition.
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Part of the demand is also driven by the snob factor: at luxury stores, higher
  prices are often considered a mark of quality.
Indoor air quality first became a focus of attention in the 1980s.
At some point, quality gives way to quantity.
And plasma continues to set the bar in picture quality.
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