IPA: /ˌpɑː.ləˈmɛn.tə.ri.ən/
KK: /ˌpɑːr.ləˈmen.t̬ər.i.ən/
A person who is a member of a parliament or is knowledgeable about parliamentary rules and procedures.
The parliamentarian helped the committee understand the rules for their meeting.
Parliamentarian → It is formed from "parliament" (from Old French *parlement*, meaning discussion or speaking) and "-arian" (meaning one who practices or is concerned with). A parliamentarian is someone who is involved in or practices the discussions and decisions made in a parliament.
Think of someone who is involved in 'discussions' ('parlement') and practices the rules of governance ('-arian'). This helps you remember that a parliamentarian is someone who participates in parliamentary discussions.