"shortfall" in the noun sense
1. deficit, shortage, shortfall
the property of being an amount by which something is less than expected or required
"new blood vessels bud out from the already dilated vascular bed to make up the nutritional deficit"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License