The difference between Quality and Quiddity
When used as nouns, quality means level of excellence, whereas quiddity means the essence or inherent nature of a person or thing.
Quality is also adjective with the meaning: being of good worth, well made, fit for purpose.
check bellow for the other definitions of Quality and Quiddity
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Quality as a noun (uncountable):
Level of excellence.
Examples:
"This school is well-known for having teachers of high quality."
"'Quality of life is usually determined by health, education, and income."
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Quality as a noun (countable):
A property or an attribute that differentiates a thing or person.
Examples:
"One of the qualities of pure iron is that it does not rust easily."
"While being impulsive can be great for artists, it is not a desirable quality for engineers."
"Security, stability, and efficiency are good qualities of an operating system."
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Quality as a noun (archaic):
High social position. (See also .)
Examples:
"A peasant is not allowed to fall in love with a lady of quality."
"Membership of this golf club is limited to those of quality and wealth."
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Quality as a noun (uncountable):
The degree to which a man-made object or system is free from bugs and flaws, as opposed to scope of functions or quantity of items.
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Quality as a noun (thermodynamics):
In a two-phase liquid–vapor mixture, the ratio of the mass of vapor present to the total mass of the mixture.
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Quality as a noun (emergency medicine, countable):
The third step in OPQRST where the responder investigates what the NOI/MOI feels like.
Examples:
"To identify quality try asking, "what does it feel like?"."
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Quality as an adjective:
Being of good worth, well made, fit for purpose.
Examples:
"We only sell quality products."
"That was a quality game by Jim Smith."
"A quality system ensures products meet customer requirements."
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Quiddity as a noun (philosophy):
The essence or inherent nature of a person or thing.
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Quiddity as a noun (legal):
A trifle; a nicety or quibble.
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Quiddity as a noun:
An eccentricity; an odd feature.