plural of quantum

(dated) A person of three-fourths Caucasian descent and one fourth African descent. / (Australia, dated) A person of three-quarters Caucasian descent and one quarter Aboriginal descent.

(dated) Having three-fourths Caucasian descent and one-fourth African descent.

(Christianity) Synonym of Lent. / (Christianity) Synonym of Quadragesima Sunday: the first Sunday in Lent.

An essential or indispensable element, condition, or ingredient.

A state of not knowing what to decide; a state of difficulty or perplexity; a state of uncertainty, hesitation or puzzlement. / A dilemma, a difficult decision or choice.

(quantum mechanics) One of certain integers or half-integers that specify the state of a quantum mechanical system (such as an electron in an atom).

(quantum mechanics) The discontinuous change of the state of an electron in an atom or molecule from one energy level to another. / (figuratively) An abrupt, extreme change.

(physics) The branch of physics which studies matter and energy at the level of atoms and other elementary particles, and substitutes probabilistic mechanisms in place of classical Newtonian ones.

Argumentative; fond of or prone to quarreling.