Because the definition of a word is not all all important he says before trying to define the word.
Marx and Engels provided the authoritative definition of Communism
Lol your right about that; they provided the terms for authoritative communism.
They are the authority on Marxism but not communism. There where communists before and after Marx who where not marxists.
I believe Erich Muhsam when he said that "The stateless community of free people, — that is communism, the solidarity of equals in freedom, that is anarchy!”
Anarchy is Communism; a society that is free from the rule of the state and capital; A communal society.
"It is only by the abolition of the state, by the conquest of perfect liberty by the individual, by free agreement, association, and absolute free federation that we can reach Communism - the possession in common of our social inheritance, and the production in common of all riches." ~Peter Kropotkin
"Let us fight to free the world - to do away with national barriers - to do away with greed, with hate and intolerance. Let us fight for a world of reason, a world where science and progress will lead to all men’s happiness. Soldiers! in the name of democracy, let us all unite!" ~Charles Chaplin
"Communism is Anarchy. You can't regulate or reform your way to communism; it can only be achieved by direct action against state, class and capital."