What is security?
From Webster's College Dictionary:
security, n.
1. the state or quality of being secure;
freedom from fear or danger
2. defense or protection
3. something given to secure
the fulfillment of a contract; pledge
4. one who becomes surety for another
5. pl. stock certificates or bonds
secure, adj.
1. free from fear, worry
2. free from danger; safe
3. firm, stable, or dependable