Definition of "quantum" in English

noun

1. (now chiefly South Asia or law) The total amount of something; quantity.

2. The amount or quantity observably present, or available.

3. (physics) The smallest possible, and therefore indivisible, unit of a given quantity or quantifiable phenomenon.

4. (computing) The amount of time allocated for a thread to perform its work in a multithreaded environment.

5. (computing, uncountable) Ellipsis of quantum computing.

   • Developing for quantum has never been more accessible.

6. (medicine) The minimum dose of a pathogen required to cause an infection.

7. (mathematics) A definite portion of a manifoldness, limited by a mark or by a boundary.

adjective

1. Of a change, sudden or discrete, without intermediate stages.

2. (informal) Of a change, significant.

3. (physics) Involving quanta, quantum mechanics or other aspects of quantum physics.