olemus
sõltub kontekstist

(a) andmete edastuskiirus arvuti sees või
keskseadme ja välisseadme vahel, byte/s
Wiktionary:
2. (electronics) the speed at which data is sent over a data link or channel; generally expressed in bytes per second

(b) audio- või videofaili pakkimiskiirus, bit/s
= audio/video file compression speed in bits per second

(c) ISO/IEC TR 18053 jm:
kanali bitikiirus, bit/s
= the capacity of a channel to carry data, measured in bits per second

näiteid
https://image.slidesharecdn.com/datatransmissionrateandbandwidth293031-150323055737-conversion-gate01/95/data-transmission-rate-and-bandwidth-4-1024.jpg

ülevaateid
https://en.wikipedia.org/wiki/Data_rate