WordNet (r) 3.0 (2006):

sampling frequency
    n 1: (telecommunication) the frequency of sampling a
         continuously varying signal

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

sample rate
sampling frequency

    The number of times an analog
   signal is measured (sampled) per second.  The unit of sample
   rate is "samples per second".  This is often expressed in
   kiloHertz (kHz).  For example, "CD quality" sound has a
   sample rate of 44 kHz.

   Compare data rate.  See Nyquist frequency.

   [Is it correct to use Hertz for things other than the
   frequency of a sine wave?]

   (2001-06-06)