noun.
A lengthy passage in a dramatic or literary work, especially a dull or tedious one; a period of boredom.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a period of dullness or boredom (especially in a work of literature or performing art)
Word Usage
"Martina Hingis, welcoming Sharapova's return to form after a disturbing longueur, described her this week as "a great competitor, so strong in the mind"."