WordNet

approximate (a signal varying continuously in amplitude) by one whose amplitude is restricted to a prescribed set of discrete values (同)quantise
apply quantum theory to; restrict the number of possible values of (a quantity) or states of (a physical entity or system) so that certain variables can assume only certain discrete magnitudes that are integral multiples of a common factor; "Quantize grav (同)quantise
the act of dividing into quanta or expressing in terms of quantum theory (同)quantisation