Theory
Etymology
From Greek "theoria" (contemplation, a looking at, a viewing), from "theorein" (to look at, observe) — related to "thea" (a view) and horan (to see); a "theoros" was a spectator sent to view the games or an oracle. Buried in the most powerful word in science is the humble act of looking closely.
noun · /THEER-ee/
A well-substantiated explanatory framework that organizes many facts and predictions.
What it names
Reach for it to name our most reliable kind of knowledge — the tested scaffolding that explains a whole domain, not a passing guess.
Example
The theory of plate tectonics explains earthquakes, mountain ranges, and the shapes of the continents in one framework.
Related idea
The everyday and scientific senses fight here. In "it’s just a theory," theory means an unsupported hunch — closer to a hypothesis. In science, a theory is the opposite: an idea that has earned its authority by surviving repeated testing.
See also