theory

110 ENTRIES FOUND:

the·o·ry

noun \ˈthē-ə-rē, ˈthir-ē\

: an idea or set of ideas that is intended to explain facts or events

: an idea that is suggested or presented as possibly true but that is not known or proven to be true

: the general principles or ideas that relate to a particular subject

plural the·o·ries

Full Definition of THEORY

1
:  the analysis of a set of facts in their relation to one another
2
:  abstract thought :  speculation
3
:  the general or abstract principles of a body of fact, a science, or an art <music theory>
4
a :  a belief, policy, or procedure proposed or followed as the basis of action <her method is based on the theory that all children want to learn>
b :  an ideal or hypothetical set of facts, principles, or circumstances —often used in the phrase in theory <in theory, we have always advocated freedom for all>
5
:  a plausible or scientifically acceptable general principle or body of principles offered to explain phenomena <the wave theory of light>
6
a :  a hypothesis assumed for the sake of argument or investigation
b :  an unproved assumption :  conjecture
c :  a body of theorems presenting a concise systematic view of a subject <theory of equations>

Examples of THEORY

  1. a widely accepted scientific theory
  2. Her method is based on the theory that all children want to learn.
  3. There are a number of different theories about the cause of the disease.
  4. She proposed a theory of her own.
  5. Investigators rejected the theory that the death was accidental.
  6. There is no evidence to support such a theory.
  7. He is a specialist in film theory and criticism.
  8. The immune surveillance theory of cancer holds that in a way we all do have cancer, that a healthy immune system fights off rogue cells as they appear. —Sallie Tisdale, Harper's, June 2007

Origin of THEORY

Late Latin theoria, from Greek theōria, from theōrein
First Known Use: 1592

the·o·ry

noun \ˈthē-ə-rē, ˈthi(-ə)r-ē\   (Medical Dictionary)
plural the·o·ries

Medical Definition of THEORY

1
: the general or abstract principles of a body of fact, a science, or an art <the theory and practice of medicine>
2
: a plausible or scientifically acceptable general principle or body of principles offered to explain natural phenomena <a theory of organic evolution>—see atomic theory, cell theory, germ theory
3
: a working hypothesis that is considered probable based on experimental evidence or factual or conceptual analysis and is accepted as a basis for experimentation
the·o·ret·i·cal \ˌthē-ə-ˈret-i-kəl, ˌthi(ə)r-ˈet-\ also the·o·ret·ic \-ik\ adjective
the·o·ret·i·cal·ly \-i-k(ə-)lē\ adverb

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