1.
major, mainstream, well-known
Widely known, popular, or established. Used to describe things or people that are prominent and recognized by many.
Major vs mainstream
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, and 日本のメジャー can refer to NPB.
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)