1. theory-based

adjective. based in theory rather than experiment.

Rhymes with Malthusian Theory

• yomiuri

2. Malthusian

noun. a believer in Malthusian theory.

3. M-theory

noun. (particle physics) a theory that involves an eleven-dimensional universe in which the weak and strong forces and gravity are unified and to which all the string theories belong.

4. theory

noun. ['ˈθɪri, ˈθiːɝi'] 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.

5. theory

noun. ['ˈθɪri, ˈθiːɝi'] a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena.

6. theory

noun. ['ˈθɪri, ˈθiːɝi'] a belief that can guide behavior.