Prominent; principal; leading — indicating something notable or the main items among others.
会議の出席者は主だった研究者と行政担当者だった。
The meeting's attendees were mainly prominent researchers and administrative officials.
報告書には主だった問題点と改善案が挙げられている。
The report lists the main issues and proposed improvements.
主だった候補者は三人に絞られた。
The leading candidates were narrowed down to three.