1. n. [Geophysics]

The set of values an independent variable can take. For example, the independent variable of the time domain is time; and for the frequency domain, it is frequency.

See: absorbing boundary conditions,  f-k domain,  frequency domain,  time domain

2. n. [Reservoir Characterization]

A region of magnetic polarity within a ferromagnetic body. Domains collectively determine the magnetic properties of the body by their arrangement.

3. n. [Reservoir Characterization]

A region characterized by a specific feature.

4. n. [Reservoir Characterization]

The set of values assigned to the independent variables of a function.