**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.