noun, plural the·o·ries.
Origin of theory
Related Words for theoriescode, doctrine, argument, concept, thesis, system, assumption, suspicion, proposal, scheme, approach, method, premise, philosophy, idea, plan, rationale, understanding, provision, ideology
Examples from the Web for theories
Contemporary Examples of 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
December 30, 2014
He acknowledged the theories but his voice lacked conviction.Alfred Hitchcock’s Fade to Black: The Great Director’s Final Days
December 13, 2014
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
November 15, 2014
His theories and interpretations are often astonishingly insightful.
This makes a certain sense given his deep knowledge of the theories of previous scientists.
Historical Examples of theories
These theories were also in their consequences far-reaching.'Tis Sixty Years Since
Charles Francis Adams
Many of his theories are no doubt impracticable and unsound.The Works of Whittier, Volume VII (of VII)
John Greenleaf Whittier
Unconsciously his whole practice began to refute his theories.
We must take them into our alliance, or they will destroy all our theories of self-government.
Other theories with regard to the origin of the hundred have been suggested.English Villages
P. H. Ditchfield
noun plural -ries
Word Origin for theory
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.