# Lorentz factor

## English

### Etymology

From its appearance in Lorentzian electrodynamics, named after the Dutch physicist Hendrik Lorentz.

### Noun

Lorentz factor (plural Lorentz factors)

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1. (physics) a factor arising frequently in special relativity, to calculate the degree of time dilation, length contraction and relativistic mass of an object moving relative to an observer, defined as ${\displaystyle (1-v^{2}/c^{2})^{-0.5}}$, where v and c are relative velocity and the speed of light, respectively