a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena | (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles |
a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena | a theory of the structure of the atom |
a belief that can guide behavior | |