IPA: /ˈsɛnətər/
KK: /ˈsɛnətər/
A person who is a member of a legislative body called a senate, usually responsible for making laws and representing the interests of their constituents.
The senator spoke passionately about the new education reform bill.
Senator → It is formed from "senex" (meaning old) and the suffix "-tor" (meaning one who). The word "senator" refers to one who is old or experienced, typically a member of a governing body.
Think of an 'old' ('senex') person who is a 'member' ('-tor') of a governing body — that's why a senator is often seen as an experienced leader.