In its more famous incarnation it applied to the flatus vocis doctrine of Roscelin.  
This philosophical concept originally applied to a theory which holds that inflected verbs have the same significance as verbs in the present indicative.  In its more famous incarnation it applied to the flatus vocis doctrine of Roscelin.  It was moderated by Abelard's Conceptualism although later, it became more extreme under William of Ockham who fiercely opposed the idea of Platonic forms.  FTP identify this philosophical doctrine that held abstract concepts to have no reality outside of the mind, and which takes its name from the Latin for "of or pertaining to names."
This philosophical concept originally applied to a theory which holds that inflected verbs have the same significance as verbs in the present indicative.  
Nominalism