a person who holds a credit card or debit card
"The bank called to remind every cardholder that their new cards would arrive by Friday."
a player who holds a card or cards in a card game
"After everyone else folded, the lucky cardholder revealed his full hand to win the pot."
A case for holding cards, as credit cards, bankcards, or business cards.
"She reached into her leather cardholder to pull out a few business cards before introducing herself at the networking event."