I did not know the answer however i thought the question may have been incorrect and been accually 'what is madrigalism' and the answer to that is: A madrigal is a type of secular vocal music composition, written during the Renaissance and early Baroque eras. Throughout most of its history it was polyphonic and unaccompanied by instruments, with the number of voices varying from two to eight, but most frequently three to six.
Note: You can find the definition of works by going to Google.co.uk and typing defind: and putting the word you wish to define after that. Simple :)