The phrase "primary cardmember" refers to the person who initially applies for and owns a credit card account. They are responsible for making payments, managing the account, and have the main authority over the card. Full definition
Free first checked bag for primary cardmember and one companion traveling on the same reservation on United - operated flights when purchasing tickets with their United MileagePlus Explorer Card. (thetravelsisters.com)
Miles may be earned on purchases made by primary cardmembers and authorized users. (rewardexpert.com)
Companion certificate — Primary cardmembers earn a $ 99 domestic economy fare American Airlines Companion Certificate after spending more than $ 30,000 on eligible purchases. (upgradedpoints.com)