Someone who pays for goods or services (http://wordnetweb.princeton.edu/perl/webwn?s=concept&sub=Search+WordNet&o2=&o0=1&o8=1&o1=1&o7=&o5=&o9=&o6=&o3=&o4=&h=)

"Internal or external stakeholders who benefit from the development of a solution". PMI (2017)