(something that provides) safety, freedom from danger or anxiety; something valuable, e.g. a life insurance policy, given as a guarantee for the payment of a loan or the fulfilment of a promise etc
safety, protection
Cases of word usage
1) (an instance of, payment given for) security against damage or loss, or as compensation (indemnity)
2) the least valuable piece; to deposit (clothing, jewellery etc) as security for money borrowed (pawn)
3) a constitutional right of a sovereign, president, legislative assembly or other body, or a member of the United Nations Security Council, to reject of forbid something; statement that rejects or prohibits something (veto)
