Definition from macmillandictionary.com
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a central heating system
I decided to install a security system after the shop was burgled.
the capital’s inadequate public transport system
First, check that the circulatory system is working properly.
a new computer system
The magazine is produced using a desktop publishing system.
The system requirements for this program are listed below.
a legal/educational/political system
a two-party/multiparty system
the criminal justice system
They are introducing a very sophisticated system for delivering information.
a democratic system of government
There is simply no system to the way Joshua works.
You can’t beat the system.
Lack of sleep can be hard on the system.