window function

Noun

 * 1)  A function that performs a calculation using values from several rows, but does not group them into a single row.
 * 2)  A function that limits a signal to a restricted portion of time or frequencies.
 * 1)  A function that limits a signal to a restricted portion of time or frequencies.
 * 1)  A function that limits a signal to a restricted portion of time or frequencies.