1 things that are done to keep a person, building, or country safe from danger or crime COLLOCATIONS 
strict/tight security (=careful security) lax security (=security that is not careful enough) national/state security (=the security of a country against its enemies) tighten security (=make security better) breach of security (=when something dangerous happens, in spite of security measures) for security reasons the security services/forces (=the police, army etc) security camera security check security measures/arrangements maximum security prison/jail
protection from danger
[uncountable]
strict/tight security (=careful security) lax security (=security that is not careful enough) national/state security (=the security of a country against its enemies) tighten security (=make security better) breach of security (=when something dangerous happens, in spite of security measures) for security reasons the security services/forces (=the police, army etc) security camera security check security measures/arrangements maximum security prison/jail
2 protection from bad things that could happen to you :
Parenting is about giving your child security and love.
protection from bad situations
[uncountable]
Parenting is about giving your child security and love.3 the department of a company or organization that deals with the protection of its buildings and equipment :
One of the sales clerks called security. ➔ security guard
guards
[uncountable]BBC
One of the sales clerks called security.4 something such as property that you promise to give someone if you cannot pay back money you have borrowed from them
borrowing money
[uncountable]BFLWORD FOCUS: airport 
what you do at the airport:When you arrive at the airport, you go into the terminal building. You check in for your flight at the check-in desk. You show your passport at passport control and then go through security, where they check that you are not carrying any weapons. If you have time you can wait for your flight in the departure lounge. When your flight is called, you go through the departure gate in order to get onto the plane. The plane then takes off from the runway. After your plane has landed, you go to the baggage reclaim to collect your bags, then go through customs and immigration, where they check your passport and your bags. You then go out into the arrivals area.
➔ See also airport

what you do at the airport:When you arrive at the airport, you go into the terminal building. You check in for your flight at the check-in desk. You show your passport at passport control and then go through security, where they check that you are not carrying any weapons. If you have time you can wait for your flight in the departure lounge. When your flight is called, you go through the departure gate in order to get onto the plane. The plane then takes off from the runway. After your plane has landed, you go to the baggage reclaim to collect your bags, then go through customs and immigration, where they check your passport and your bags. You then go out into the arrivals area.
➔ See also airport

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