IPA: //ˈkeɪtərər//
KK: /ˈkeɪtərər/
A person or company that prepares and serves food for events or special occasions.
The caterer provided a delicious buffet for the wedding reception.
Caterer → It is formed from "cater" (from Old French *acater*, meaning to provide or supply) and "-er" (meaning a person who). A caterer is a person who provides food and services for events.
Think of someone who 'provides' ('cater') food and services — the '-er' just means a person. A caterer is someone who supplies food for events.