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==Etymology==
Middle French or Medieval [[Latin]]; Middle French valide, from Medieval Latin validus, from Latin, strong, potent, from valēre
*Date: [http://www.wikipedia.org/wiki/16th_Century 1571]
==Definitions==
*1 : having [[legal]] efficacy or [[force]]; especially : [[executed]] with the proper [[legal]] [[authority]] and formalities <a valid contract>
*2 a : well-grounded or justifiable : being at once relevant and meaningful <a valid [[theory]]>
:b : [[logic]]ally correct <a valid argument> <valid [[inference]]>
*3 : appropriate to the end in view : [[effective]] <every craft has its own valid [[methods]]>
*4 of a taxon : conforming to accepted principles of sound biological [[classification]]
==Synonyms==
sound, cogent, convincing, telling mean having such [[force]] as to compel serious [[attention]] and usually [[acceptance]]. valid implies being supported by [[objective]] [[truth]] or generally accepted [[authority]] <a valid reason for being absent>
==Description==
The term '''validity''' in [[logic]] (also logical validity) is largely synonymous with logical [[truth]], however the term is used in [[different]] [[contexts]]. Validity is a property of [[formulas]], [[statements]] and [[arguments]]. A logically valid [[argument]] is one where the conclusion follows from the premises. An invalid argument is where the conclusion does not follow from the premises. A deductive argument may be valid but not sound. In other [[words]], validity is a [[necessary]] condition for [[truth]] of a deductive syllogism but is not a sufficient condition.
[[Category: Philosophy]]
==Etymology==
Middle French or Medieval [[Latin]]; Middle French valide, from Medieval Latin validus, from Latin, strong, potent, from valēre
*Date: [http://www.wikipedia.org/wiki/16th_Century 1571]
==Definitions==
*1 : having [[legal]] efficacy or [[force]]; especially : [[executed]] with the proper [[legal]] [[authority]] and formalities <a valid contract>
*2 a : well-grounded or justifiable : being at once relevant and meaningful <a valid [[theory]]>
:b : [[logic]]ally correct <a valid argument> <valid [[inference]]>
*3 : appropriate to the end in view : [[effective]] <every craft has its own valid [[methods]]>
*4 of a taxon : conforming to accepted principles of sound biological [[classification]]
==Synonyms==
sound, cogent, convincing, telling mean having such [[force]] as to compel serious [[attention]] and usually [[acceptance]]. valid implies being supported by [[objective]] [[truth]] or generally accepted [[authority]] <a valid reason for being absent>
==Description==
The term '''validity''' in [[logic]] (also logical validity) is largely synonymous with logical [[truth]], however the term is used in [[different]] [[contexts]]. Validity is a property of [[formulas]], [[statements]] and [[arguments]]. A logically valid [[argument]] is one where the conclusion follows from the premises. An invalid argument is where the conclusion does not follow from the premises. A deductive argument may be valid but not sound. In other [[words]], validity is a [[necessary]] condition for [[truth]] of a deductive syllogism but is not a sufficient condition.
[[Category: Philosophy]]
