Password

A secret that a Claimant memorizes and uses to authenticate his or her identity. Passwords are typically character strings.
SOURCE: SP 800-63

A protected character string used to authenticate the identity of a computer system user or to authorize access to system resources.
SOURCE: FIPS 181

A string of characters (letters, numbers, and other symbols) used to authenticate an identity or to verify access authorization.
SOURCE: FIPS 140-2

A protected/private string of letters, numbers, and/or special characters used to authenticate an identity or to authorize access to data.
SOURCE: CNSSI-4009