hon·o·rar·i·um 
(ŏn′ə-rârē-əm)
(ŏn′ə-rârē-əm)n. pl. hon·o·rar·i·ums or hon·o·rar·i·a (-ē-ə)
A payment given to a professional person for services for which fees are not legally or traditionally required.
[Latin honōrārium, from neuter of honōrārius, honorary, from honor, honor.]