Definitions:

1. a deficiency or failure in neurological or mental functioning noun
   • the people concerned have a deficit in verbal memory
2. an excess of liabilities over assets, usually over a certain period noun
   • Last year there was a serious budgetary deficit.
3. the property of being an amount by which something is less than expected or required noun
   • new blood vessels bud out from the already dilated vascular bed to make up the nutritional deficit

Synonyms:

• shortfall