To make safe; to relieve from apprehensions of, or exposure to, danger; to guard; to protect.

To put beyond hazard of losing or of not receiving; to make certain; to assure; frequently with against or from, or formerly with of.

“to secure a creditor against loss; to secure a debt by a mortgage”

To make fast; to close or confine effectually; to render incapable of getting loose or escaping.

“to secure a prisoner; to secure a door, or the hatches of a ship”

Free from attack or danger; protected.

Free from the danger of theft; safe.

Free from the risk of eavesdropping, interception or discovery; secret.