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  2. Thesaurus - Wikipedia

    en.wikipedia.org/wiki/Thesaurus

    Thesaurus Linguae Latinae. A modern english thesaurus. A thesaurus (pl.: thesauri or thesauruses), sometimes called a synonym dictionary or dictionary of synonyms, is a reference work which arranges words by their meanings (or in simpler terms, a book where one can find different words with similar meanings to other words), [1] [2] sometimes as a hierarchy of broader and narrower terms ...

  3. Necessity and sufficiency - Wikipedia

    en.wikipedia.org/wiki/Necessity_and_sufficiency

    A number's being divisible by 4 is sufficient (but not necessary) for it to be even, but being divisible by 2 is both sufficient and necessary for it to be even. Example 3 An occurrence of thunder is a sufficient condition for the occurrence of lightning in the sense that hearing thunder, and unambiguously recognizing it as such, justifies ...

  4. Synonym - Wikipedia

    en.wikipedia.org/wiki/Synonym

    A thesaurus or synonym dictionary lists similar or related words; these are often, but not always, synonyms. [15] The word poecilonym is a rare synonym of the word synonym. It is not entered in most major dictionaries and is a curiosity or piece of trivia for being an autological word because of its meta quality as a synonym of synonym.

  5. Necessary and Proper Clause - Wikipedia

    en.wikipedia.org/wiki/Necessary_and_Proper_Clause

    The Necessary and Proper Clause, also known as the Elastic Clause, [1] is a clause in Article I, Section 8 of the United States Constitution: The Congress shall have Power... To make all Laws which shall be necessary and proper for carrying into Execution the foregoing Powers, and all other Powers vested by this Constitution in the Government ...

  6. Sine qua non - Wikipedia

    en.wikipedia.org/wiki/Sine_qua_non

    A sine qua non (/ ˌ s aɪ n i k w eɪ ˈ n ɒ n, ˌ s ɪ n i k w ɑː ˈ n oʊ n /, [1] Latin: [ˈsɪnɛ kʷaː ˈnoːn]) or conditio sine qua non (plural: conditiones sine quibus non) is an indispensable and essential action, condition, or ingredient.

  7. If and only if - Wikipedia

    en.wikipedia.org/wiki/If_and_only_if

    Wherever logic is applied, especially in mathematical discussions, it has the same meaning as above: it is an abbreviation for if and only if, indicating that one statement is both necessary and sufficient for the other. This is an example of mathematical jargon (although, as noted above, if is more often used than iff in statements of definition).

  8. Talk:Thesaurus - Wikipedia

    en.wikipedia.org/wiki/Talk:Thesaurus

    Onomasticon, though it's more that thesaurus falls within its definition than an actual synonym. Definition: a collection or listing of names or words in a specialized field 99.30.12.54 ( talk ) 13:56, 10 December 2013 (UTC) [ reply ]

  9. Necessary evil - Wikipedia

    en.wikipedia.org/wiki/Necessary_evil

    The concept of "necessary evil" is an idea that must be thoroughly rejected. Evil is not necessary, and to accept it as such is to perpetuate it. Evil must be opposed, rejected, and avoided at all costs. It should never be viewed as something that we must unavoidably and inevitably participate in. We trivialize evil when we refer to it as ...