The difference between Contingency and Tautology
When used as nouns, contingency means the quality of being contingent, of happening by chance, whereas tautology means redundant use of words, a pleonasm, an unnecessary and tedious repetition.
check bellow for the other definitions of Contingency and Tautology
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Contingency as a noun (uncountable):
The quality of being contingent, of happening by chance; unpredictability.
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Contingency as a noun (countable):
A possibility; something which may or may not happen. A chance occurrence, especially in finance, unexpected expenses.
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Contingency as a noun (countable):
An amount of money which a party to a contract has to pay to the other party (usually the supplier of a major project to the client) if he or she does not fulfill the contract according to the specification.
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Contingency as a noun (logic, countable):
A statement which is neither a tautology nor a contradiction.
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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.