All 4 Uses

Social Security
in
The Guardian, by Nicholas Sparks
(Auto-generated)

Maybe you can pull up a Social Security number and driver's license number, as well as references.†
Chpt 31 *
She did manage to get his Social Security and driver's license numbers, and as she sat at Pete Gandy's desk, she typed those into the computer.†
Chpt 31
Name, Social Security number, latest address, previous address, bank account number—she hit paydirt.†
Chpt 31
The real Richard Franklin wasn't married, and aside from his mother—who passed away in a nursing home last year—there was no one to notice if his Social Security number was back in use.†
Chpt 39

Definitions:

(1) (Social Security as in: the US program)
generally thought of as the U.S. retirement income that is funded through payroll taxes (though social security legislation includes many other programs that provide a safety net for Americans)

In addition to retirement benefits, Social Security offers unemployment insurance, and assistance for dependents and the blind (now disability in general). In 1965, medical benefits were added through Medicare legislation and in 2003, prescription drug benefits were added.
(2) (meaning too rare to warrant focus)