IPA: /ˌɒnəˈrɛəriəm/
KK: /ˌɑːnəˈrɛriəm/
A payment made to someone for their professional services when there is no legal or traditional requirement to pay a fee.
The speaker received an honorarium for delivering the keynote address at the conference.
Honorarium is formed from "honor" (from Latin "honor", meaning esteem or respect) and "-arium" (a suffix used in Latin to denote a place associated with a specific function). The word "honorarium" refers to a payment given for professional services rendered, often in recognition of respect or esteem for the work done.
Think of 'honor' as respect and '-arium' as a place or context — an honorarium is a payment given in recognition of the respect for someone's professional contribution.