retainer
Pronunciation:
/ɹɪˈteɪn.ə//ɹəˈteɪn.ɚ/noun
Definitions
Any thing or person that retains.
A dependent or follower of someone of rank.
A paid servant, especially one who has been employed for many years.
A fee one pays to reserve the other's time for services.
Example: This lawyer charges a retainer for his work.