All 4 Uses

communism
in
Slaughterhouse-Five
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We asked him how it was to live under Communism, and he said that it was terrible at first, because everybody had to work so hard, and because there wasn't much shelter or food or clothing.†
Chpt 1 *

communism = an economic system that abolishes private ownership of property with the goal of a classless society
He said that Americans had no choice but to keep fighting in Vietnam until they achieved victory or until the Communists realized that they could not force their way of life —on weak countries.†
Chpt 3

communists = people who support an economic system that abolishes private ownership of property with the goal of a classless society
The British had no way of knowing it, but the candles and the soap were made from the fat of rendered Jews and Gypsies and fairies and communists, and other enemies of the State.†
Chpt 5
'You're going to have to fight the Communists sooner or later,' said Campbell.†
Chpt 8

Definitions:

(1) (communism)
an economic system that abolishes private ownership of property with the goal of a classless society
(2) (meaning too rare to warrant focus)