You already know.
By bourgeoisie is meant the class of modern capitalists, owners of the means of social production and employers of wage labor. By proletariat, the class of modern wage laborers who, having no means of production of their own, are reduced to selling their labor power in order to live.
- Friedrich Engels, The Communist Manifesto, footnote (1888 edition)
The class of big capitalists, who, in all civilized countries, are already in almost exclusive possession of all the means of subsistance and of the instruments (machines, factories) and materials necessary for the production of the means of subsistence. This is the bourgeois class, or the bourgeoisie.
- Friedrich Engels, Principles of Communism (1847) [2]