A singular measure is a measure or probability distribution whose support has zero Lebesgue measure. More generally, one may speak of an object "singular with respect to a measure ?", meaning that ? replaces the Lebesgue measure above
An infinite cardinal number is called singular if it is not a regular cardinal
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Singulair, Merck trademark for Montelukast, a common prescription drug used in maintenance treatment of asthma and to relieve symptoms of seasonal allergies.