evidence proving that you are who you say you are; evidence establishing that you are among the group of people already known to the system; recognition by the system leads to acceptance

ask someone for identification to determine whether he or she is old enough to consume liquor

a card on which are printed the person's name and business affiliation

a card that you carry on your person and that authorizes the use of your organs for transplantation after your death

a plastic card that has a magnetically coded strip that is scanned in order to operate a mechanism

a card certifying membership in an organization

a card certifying the bearer's right to use the library