any marvelously effective means for bringing about a desired result:
Wealth is the open sesame to happiness.
a very successful means of achieving a result


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    noun 1. Mathematics. an equation or inequality containing one or more variables in which its truth or falsehood depends upon the values assumed by the variables in a particular instance, as the equation x + 3 = 8. 2. Logic. a propositional function that contains a free variable, as “ x is a man.”. noun […]

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    [oh-puh n-shelf] /ˈoʊ pənˈʃɛlf/ adjective 1. .

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    [oh-puh n-sahy-did] /ˈoʊ pənˈsaɪ dɪd/ adjective 1. having a side or sides open.

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