QCD

Noun

quality (countable and uncountable, plural qualities)

1. (countable) The kind, condition, and/or the set of characteristics of something, as opposed to the quantity of something.
   • The lattice structure of a steel profoundly changes its qualities.
2. (countable) A single trait.
   • While being impulsive can be great for artists, it is not a desirable quality for engineers.
3. (uncountable) Good characteristics in particular; level of excellence; freedom of faults and flaws.
   • This school is well-known for having teachers of high quality.

   Synonyms:

   duty

4. (attributive, occasionally proscribed) Good worth, good make.
   • For this building project we need to use quality materials that will last for many decades.
5. (archaic) Position; status; rank.
   • The firſt Solemn Embaſſy that the French King ſent to the late King of SIAM, was in the Year 1685, by Monſieur de Chaumont, who went in Quality of Ambaſſador Extraordinary […]1690, “The Preface to the Reader”, in A Full and True Relation of the Great and Wonderful Revolution That Hapned Lately in the Kingdom of Siam in the East-Indies, London: Randal Taylor, page i
6. (archaic) High social position. (See also the quality.)
   • A peasant is not allowed to fall in love with a lady of quality.

See all 9 meanings of quality

Noun

quantum chromodynamics (uncountable)

1. (quantum mechanics) A quantum field theory in particle physics which describes the strong interaction of quarks and gluons employing the concept of color charge.