bandwidth

Short definition from Wiktionary

Noun

1. 1
   The width, usually measured in hertz, of a frequency band.
2. 2
   The width of the smallest frequency band within which the signal can fit.
3. 3
   The rate of data flow in digital networks typically measured in bits per second; the bitrate.
4. 4
   The capacity, energy or time required.
5. 5
   The minimum, over all orderings of vertices of a given graph, of the length of the longest edge.