tautology
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Definition & Meaning of "tautology"in English

Tautology
01

the redundant repetition of an idea using different words in a sentence or phrase 

Grammatical Information
Animacy status
Abstract
Composition
Compound
Countable
Plural form
tautologies
Examples
"ATM machine" is a classic example of a tautology, as the "M" already stands for "machine." 
02

a statement or proposition that is true in all possible interpretations, often due to its logical structure 

Examples
"It will either rain tomorrow or it will not" is a tautology in logic. 
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