Definitions

1. noun

A unit of energy in the International System of Units, equal to the energy gained by an electron when it moves through a potential difference of one volt.

“The physicist calculated the energy of the particle in units of planck.”

2. proper noun

Maksymilian Maria Planck, a German physicist who is considered the originator of the quantum theory, or Max Planck, a unit of measurement.

“Max Planck is often credited with the discovery of the quantum theory.”