quantum
UK: ˈkwɒntəm | US: ˈkwɑːntəm
n. a discrete quantity of energy or matter in physics
n. (general) a required or allowed amount
n. (figurative) a significant or substantial amount
Derived from Latin quantus ("how much"), quantum originally referred to a measurable amount. In physics, it was adopted in the early 20th century to describe indivisible units of energy (e.g., photons), popularized by Max Planck’s quantum theory. The root quant- retains its core meaning of measurement, while the suffix -um marks it as a neuter noun in Latin. The word’s evolution reflects a shift from abstract quantity to precise scientific terminology.
Quantum mechanics revolutionized our understanding of atomic particles.
The lawyer argued for a quantum of damages proportional to the injury.
Planck introduced the idea that energy exists in discrete quanta.
There’s a quantum difference between these two approaches.
The project requires a quantum of effort to succeed.