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theory vs theories

Both 'theory' and 'theories' are correct, but they are used in different contexts. 'Theory' is singular, referring to a single idea or concept, while 'theories' is the plural form, used when referring to multiple ideas or concepts.

Last updated: April 01, 2024 • 1018 views

theory

Correct. 'Theory' is the singular form used to refer to a single idea or concept.

Use 'theory' when you are talking about a single idea, concept, or hypothesis.

Examples:

The theory of relativity explains the relationship between space and time.
Her theory about the origins of the universe is widely debated.

Show examples from the web [+]

Sorry the Swedes disproved your theory.
Revolutionary theory can thus not own total existence.
He himself never denied the suicide theory.
But the dragon-king theory gives hope.
Most chemists are not experts in evolutionary theory.
I agree with Prokosch's theory.
It proves my theory is correct.
Big Bang theory is cartoon physics.
Chaos theory seems predictable by comparison.
Tess might actually like the theory.
You had some far-fetched theory about election rigging.
String theory has always predicted they exist.
But his deflection confirms our theory.
Currently, our top theory is invisible gnomes.
It's all probability theory and mathematics.
Our theory of motive has been punctured.
Our hooded man theory has been shredded.
So your theory is based on an unverifiable witness.
Mozzie's first conspiracy theory and his coping mechanism.
I thought scientists disproved that theory.

Alternatives:

hypothesis
concept
idea
principle

theories

Correct. 'Theories' is the plural form used when referring to multiple ideas or concepts.

Use 'theories' when you are talking about multiple ideas, concepts, or hypotheses.

Examples:

There are several theories about the causes of climate change.
Scientists have proposed different theories to explain the behavior of black holes.

Show examples from the web [+]

These theories suggest that history immune effort.
Alcoholism and Berry aneurysm are both valid theories.
Popular theories that abstinence improves potency, proved false.
We still have a mess of children, but no theories.
Cmdr Data has some theories on how we might communicate.
But then new models and theories emerged.
I was always against applying our theories to animals.
Mathematical equations related to periodicity supported Kepler's theories of planetary motion.
Alternative theories were presented to explain what was observed.
And good science demands proof to confirm theories.
None of my theories panned out.
Evidence of fire spawns new theories.
Melvin says... you have some very interesting theories about your illness.
It's all theories and lofty notions and big fat ethics books.
I'd rather hear your theories.
We have two competing theories on Mr. Wong.
No, we collect facts and we formulate theories.
This firm was built on cutting-edge legal theories.
I'm not interested in your theories.
You could cause a sensation with theories like that.

Alternatives:

hypotheses
concepts
ideas
principles

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