WordNet (r) 3.0 (2006):

bits per second
    n 1: (computer science) the rate at which data is transferred
         (as by a modem) [syn: bits per second, bps]

The Free On-line Dictionary of Computing (30 December 2018):

bits per second
bps

    (bps, b/s) The unit in which data
   rate is measured.

   For example, a modem's data rate is usually measured in
   kilobits per second.  In 1996, the maximum modem speed for
   use on the PSTN was 33.6 kbps, rising to 56 kbps in 1997.

   Note that kilo- (k), mega- (M), etc. in data rates denote
   powers of 1000, not 1024.

   (2002-03-23)