theory
Pronunciation
Noun
B1 Intermediate
Quick answer
An explanation of why something happens, especially one built on evidence and testing rather than a simple guess.
Synonyms and antonyms
Synonyms
Usage notes
In everyday speech "theory" can mean a guess, but in science it refers to an explanation strongly supported by evidence.
Test yourself
Which word fits the gap? "Scientists spent decades testing the _____ before it was widely accepted."
Answer: theory
In your own words, what does "theory" mean?
An explanation of why something happens, especially one built on evidence and testing rather than a simple guess.
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