honorarium
/ˌɒnəˈreərɪəm/noun
(pl. honorariums 或honoraria /-rɪə/)
- a payment given for professional services that are rendered nominally without charge（支付给名义上不收费服务的）酬金。
词源
mid 17th cent.: from Latin, denoting a gift made on being admitted to public office, from honorarius （see HONORARY）.