# gauge invariance

Also found in: Dictionary.

Related to gauge invariance: Gauge symmetry, Gauge transformation, Gauge group

## gauge invariance

[′gāj in′ver·ē·əns] (electromagnetism)

The invariance of electric and magnetic fields and electrodynamic interactions under gauge transformations.

(physics)

The invariance of any field theory under gauge transformations.

(quantum mechanics)

An invariance of a Lagrangian based on an internal gauge group, such as U(1) for electromagnetism or U(1) × SU(2) for the Weinberg-Salam unified model of weak and electromagnetic interactions.

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