**Time domain** is the analysis of mathematical functions, physical signals or time series of economic or environmental data, with respect to time. In the **time domain**, the signal or function's value is known for all real numbers, for the case of continuous time, or at various separate instants in the case of discrete time. An oscilloscope is a tool commonly used to visualize real-world signals in the **time domain**. A **time-domain** graph shows how a signal changes with time, whereas a frequency domain graph shows how much of the signal lies within each given frequency band over a range of frequencies. Wikipedia, Time Domain

See Also

**9.32 - Time**
**9.33 - Time Intervals**
**12.23 - Time orbit period**
**12.24 - Time spin period**
**Compound Time**
**Exchanging Time for Power at Center or North**
**Figure 9.12 - Scale of Locked Potentials over Time**
**Frequency Domain**
**Spacetime**
**Time**
**Time-Reversal Zone**