feature
One number computed from a window of readings that keeps something the window says.
A feature is a scalar statistic of a sample window, such as its mean, RMS, peak-to-peak, zero-crossing count or the magnitude of one spectral bin.
Examples
The RMS of one axis over a 1 s window is the single feature the lab's detector watches for imbalance.
The window's mean is a feature that reports the housing's tilt, not its vibration.
See also