1.
major, mainstream, well-known
Widely known, popular, or established. Used to describe things or people that are prominent and recognized by many.
Usage
メジャー as an adjective (sense 1) means widely known or mainstream, often contrasted with マイナー (minor, niche, obscure). In music, メジャーデビュー specifically means debuting with a major record label.
メジャーリーグ refers to Major League Baseball (MLB) in the US; on its own, メジャー often means the same thing (メジャーで活躍する, to do well in the majors).
Common collocations
Related Words
Antonym:
マイナー (minor, niche)
Related:
定規 (ruler, straightedge)
Antonym:
インディーズ (indie)
Compare:
身長計 (stadiometer)