noun, plural the·o·ries.
Origin of theory
Examples from the Web for theories
But privately, it is listening to other theories, including those about an inside job.FBI Won’t Stop Blaming North Korea for Sony Hack -- Despite New Evidence|Shane Harris|December 30, 2014|DAILY BEAST
He acknowledged the theories but his voice lacked conviction.Alfred Hitchcock’s Fade to Black: The Great Director’s Final Days|David Freeman|December 13, 2014|DAILY BEAST
And probably the truth lies somewhere in between the two theories.Blood in the Sand: When James Jones Wrote a Grunt’s View of D-Day|James Jones|November 15, 2014|DAILY BEAST
His theories and interpretations are often astonishingly insightful.
This makes a certain sense given his deep knowledge of the theories of previous scientists.
I have dealt with the chief of these theories in the ninth chapter of my History of Creation, and must refer the reader thereto.The Wonders of Life|Ernst Haeckel
On this subject there are two theories, each of which has advocates among our most eminent statesmen.
We are agreed that it is a brave martial coat we wear, but are divided in our theories of production.Merchantmen-at-Arms|David W. Bone
Early in our religious history two theories as to Church and State were developed.The Religious Life of London|J. Ewing Ritchie
But on another point the new facts at our disposal invalidate the theories of Smith.The Elementary Forms of the Religious Life|Emile Durkheim
British Dictionary definitions for theories
noun plural -ries
Word Origin for theory
Word Origin and History for theories
1590s, "conception, mental scheme," from Late Latin theoria (Jerome), from Greek theoria "contemplation, speculation, a looking at, things looked at," from theorein "to consider, speculate, look at," from theoros "spectator," from thea "a view" + horan "to see" (see warrant (n.)). Sense of "principles or methods of a science or art (rather than its practice)" is first recorded 1610s. That of "an explanation based on observation and reasoning" is from 1630s.
Medicine definitions for theories
Science definitions for theories
Culture definitions for theories
In science, an explanation or model that covers a substantial group of occurrences in nature and has been confirmed by a substantial number of experiments and observations. A theory is more general and better verified than a hypothesis. (See Big Bang theory, evolution, and relativity.)