The difference between Oxymoron and Tautology
When used as nouns, oxymoron means a figure of speech in which two words or phrases with opposing meanings are used together intentionally for effect, whereas tautology means redundant use of words, a pleonasm, an unnecessary and tedious repetition.
check bellow for the other definitions of Oxymoron and Tautology
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Oxymoron as a noun:
A figure of speech in which two words or phrases with opposing meanings are used together intentionally for effect.
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Oxymoron as a noun (loosely, sometimes, _, proscribed):
A contradiction in terms.
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Tautology as a noun (uncountable):
Redundant use of words, a pleonasm, an unnecessary and tedious repetition.
Examples:
"It is tautology to say, "Forward Planning"."
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Tautology as a noun (countable):
An expression that features tautology.
Examples:
"The expression "raze to the ground" is a tautology, since the word "[[raze]]" includes the notion "to the ground"."
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Tautology as a noun (countable, logic):
In propositional logic: a statement that is true for all truth values of its propositional variables. In first-order logic: a statement that is true for all truth values of its Boolean atoms.