theory
noun
a coherent group of tested general propositions, commonly regarded as correct, that can be used as principles of explanation and prediction for a class of phenomena.
theories
-
pluralof theory.plural
The grammatical form denoting more than one person, place, thing, or idea.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Shovel in the fact that some conspiracy theories have turned out to be at least semi-plausible—cue the drip-drip of UFO disclosures—and you have fertile soil for sprawling kudzu-like growth in the business of manufactured truth.
From The Wall Street Journal ● Aug. 13, 2026
Cox’s Gregory has theories about the second-quarter pop in auto financing: It could be attributed, at least partly, to more electric-vehicle and hybrid sales as gas prices increased, he said.
From MarketWatch ● Aug. 13, 2026
Current theories suggest that magnetic energy builds up as the Sun's magnetic field lines become twisted and coiled -- similar to the mechanical energy stored in a tightly coiled metal spring.
From Science Daily ● Aug. 8, 2026
For me, both theories hold some grain of truth.
From BBC ● Aug. 6, 2026
I had heard many theories about what happened to us after death, but even with Yakov’s dybbuk shifting inside my veins, I still didn’t have an answer.
From "The City Beautiful" by Aden Polydoros
