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In linguistics , phraseology is the study of set or fixed expressions , such as idioms , phrasal verbs , and other types of multi-word lexical units ( often collectively referred to as phrasemes ) , in which the component parts of the expression take on a meaning more specific than or otherwise not predictable from the sum of their meanings when ...
In logic, a tautology (from the Greek word ÏÎ±ÏÏÎ¿Î»Î¿Î³Î¯Î±) is a formula that is true in every possible interpretation. Philosopher Ludwig Wittgenstein first applied the term to redundancies of propositional logic in 1921.