(US) The fraction of a person's ancestors, out of their total ancestors, who are documented as full-blooded Native Americans. For instance, a person who has one parent who is a full-blood Native American and one who has no Native ancestry has a blood quantum of 1/2.

Callipepla squamata, a species of quail.

(mathematics) An irrational number that is the solution of a quadratic equation of the form ax²+bx+c=0, where a, b, and c are integers and a ≠ 0.

Homorthodes furfurata, a species of North American owlet moth.

(dated) Synonym of Mount of Temptation

(nautical) Having four masts.

Having been qualified (in some profession) for the specified time.

Of poor quality; inferior.

superlative form of high-quality: most high-quality

plural of qualitative leap