Password (noun)

1. A secret word or phrase that must be entered in order to gain access to a computer system or account.
2. A secret word or phrase that is used to confirm the identity of a user.

Origin:

From the early 20th century; earliest use found in the spectator.

Examples:

1. The password to access the website was changed for security reasons.
2. Make sure to use a strong password that includes numbers and special characters.
3. I forgot my password and had to reset it.
4. Please enter your username and password to login.
5. Some websites now use two-factor authentication in addition to a password for added security.