system

system /ˈsɪstəm/ noun
plural systems
system
/ˈsɪstəm/
noun
plural systems
Britannica Dictionary definition of SYSTEM
1 
[count] : a group of related parts that move or work together
— see also ecosystem, pa system, public address system, solar system, sound system
2 
[count]
a  : a body of a person or animal thought of as an entire group of parts that work together — usually singular
b  : a group of organs that work together to perform an important function of the body — see also central nervous system, immune system, nervous system
3 
[count] : a way of managing, controlling, organizing, or doing something that follows a set of rules or a plan
— often + of
— see also honor system, metric system, operating system
4 
the system disapproving : a powerful government or social organization that controls people's lives

all systems (are) go

— see 2go

a shock to the/your system

— see 1shock

get it out of your system

informal
1 
: to do something that you have been wanting to do so that you no longer feel a strong desire to do it
2 
: to get rid of a strong emotion (such as anger) by doing something

the buddy system

— see 1buddy