See optical isolator.

1. Pertaining to a material with properties, such as density, electrical conductivity, electric permittivity, magnetic permeability, or refractive index that do not vary with distance or direction.
2. Pertaining to a material with magnetic, electrical, or electromagnetic properties that do not vary with the direction of static or propagating magnetic, electrical, or electromagnetic fields within the material.

A hypothetical antenna that radiates or receives equally in all directions.
Note: Isotropic antennas do not exist physically but represent convenient reference antennas for expressing directional properties of physical antennas.

Synonym absolute gain.

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