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Children's Dictionary
evolution the theory that describes how all life forms developed from simpler life forms by changes that took millions of years. [1/3 definitions]
idea an opinion, theory, or conviction. [1/4 definitions]
plate tectonics (used with a singular verb) a theory that scientists use to explain the movement of continents, the eruption of volcanoes, and other changes or events in the earth's geology. The theory of plate tectonics says that the earth's crust is made up of separate sections that are like very large plates. These sections move around constantly because they float on melted rock. The movement of these sections of the crust causes earthquakes.
practical having to do with real life and experience rather than theory. [1/3 definitions]
socialism a theory of government in which the whole community rather than individuals owns all of its property and resources.