レギュラー
れぎゅらー
noun, na-adjective
regular; regular member
1.
regular member, starter
A member who regularly participates or is part of the main lineup, especially in sports teams or TV shows. Contrasts with substitute or guest members.
2.
regular (size/grade), standard
The standard or normal option, as opposed to large, premium, or special versions. Commonly used for gasoline grades and coffee sizes.
Usage: レギュラー is a loanword from English "regular" with two main uses in Japanese.
Sense 1 (regular member): Strongly associated with sports and entertainment. Being a レギュラー on a team means being a starter, not a substitute (補欠).
Sense 2 (standard grade): Most commonly heard at gas stations. Japanese gas stations offer レギュラー (regular octane) and ハイオク (high-octane/premium).