pääkortin

Pääkortin is the genitive singular form of the Finnish noun pääkortti, which translates as "the main card" or "primary card." It is used in contexts where multiple cards are issued to a person or account, and one card is designated as the default or principal credential.

In practice, pääkortti refers to the card considered primary for transactions, identification, or access within a linked set of cards. The term appears in various domains, including banking, travel passes, corporate access systems, and loyalty programs, where secondary cards may accompany the main card.

The grammatical form "pääkortin" is used to indicate possession or association, as in "pääkortin numero" (the number of the main card) or "pääkortin voimassaolo" (the validity of the main card). The plural form is pääkortit, and the genitive plural is pääkorttien.

Etymology: The word combines "pää" meaning "main" or "chief" with "kortti" meaning "card." The concept of a main or primary card is common in systems that issue multiple cards to a single user.

See also: kortti; pankkikortti; henkilökortti; identiteetti; käyttökortti.