- retainer, consideration - a fee charged in advance to retain the services of someone
--1 is a kind of fee
--1 has particulars: quid pro quo, quid - servant, retainer - a person working in the service of another (especially in the household)
--2 is a kind of worker
--2 has particulars:body servant; cabin boy; domestic, domestic help, house servant; factotum; familiar; lackey, flunky, flunkey; major-domo, seneschal; manservant; menial, dogsbody; scullion; servant girl, serving girl - retainer - a dental appliance that holds teeth (or a prosthesis) in position after orthodontic treatment
--3 is a kind of dental appliance