1. Greatness, amount; a quantity or amount of anything.
2. In physics, the smallest discrete quantity of a physical property, e.g., electromagnetic radiation or angular momentum.
3. The smallest unit used to measure a physical property.
4. Also, as an adjective, sudden, dramatic, and significant (a quantum leap, a sudden, dramatic, and significant change or advance).

1. A quantum field theory of elementary particles that states that the color properties of quarks (small particles of an atom) are bound together by gluons.
2. The physics of the relationship between color-carrying quarks, especially the nature of their strong interaction, which is characterized by the exchange of gluons.

Gluons are theoretical elementary particles without mass, thought to be involved in binding the subatomic particles of quarks together.

1. The passage of electrons through a potential barrier which they would not be able to cross according to classical mechanics; such as, a thin insulating barrier between two superconductors.
2. The phenomena of a particle's ability to penetrate energy barriers within electronic structures.

As much as pleases.

Medical directions indicating that the quantity may be as much or as little as you like.

As much as suffices.

A term used on medical prescriptions to indicate that as much of a certain component should be used as is sufficient, a decision left to the pharmacist.

As much as you wish.

Used in medical prescriptions. Don't confuse this q.v. with the Quod vide; (q.v.) meaning, "which [you should] see".

Take it for what it's worth; literally, "Let it stand for what it is worth". Used when passing on information that is of doubtful authenticity.

Let it stand for what it is worth.

Also translated as, "Take it for what it is worth." A proper statement to make when one passes on information of doubtful authenticity.