deficit

noun

def·​i·​cit ˈde-fə-sət 

 British also  di-ˈfi-sət,

 or  ˈdē-fə-sət

1

a(1)

: deficiency in amount or quality

a deficit in rainfall

(2)

: a lack or impairment in an ability or functional capacity

cognitive deficits

a hearing deficit

b

: disadvantage

scored two runs to overcome a 2–1 deficit

2

a

: an excess of expenditure over revenue

facing a deficit of $3 billion

raise taxes to help reduce the budget deficit

b

: a loss (see loss sense 4b) in business operations

the year's operating deficit

Synonyms

• shortage
• lack
• deficiency

Examples of deficit in a Sentence

The government is facing a deficit of $3 billion.

We will reduce the federal budget deficit.

The team overcame a four-point deficit to win the game.

She has a slight hearing deficit in her left ear.

Recent Examples on the Web

All but one of those runs were scored in the late innings with the Mets facing a large deficit, baseball’s equivalent of garbage. —Will Sammon, New York Times, 11 Sep. 2025

And in the worst-case scenario, countries never get fully back on track, and their TB control programs operate at permanent deficits. —Jonathan Lambert, NPR, 11 Sep. 2025

Microsoft has increasingly relied on third-party solutions to tackle a deficit in cloud infrastructure aimed at AI workloads. —Trefis Team, Forbes.com, 11 Sep. 2025

At some point in the near future, a government will likely be compelled to impose unpopular austerity measures and address the deficits in the pension system. —Jenni Reid, CNBC, 11 Sep. 2025

Word History

Etymology

borrowed from French déficit, going back to Middle French, "item lacking in an inventory," borrowed from Latin dēficit "it is lacking," 3rd person singular present indicative of dēficere "to be lacking, run short, fail" — more at deficient

First Known Use

1782, in the meaning defined at sense 1a(1)

Phrases Containing deficit

• attention deficit disorder
• attention deficit hyperactivity disorder
• deficit spending
• trade deficit

Kids Definition

deficit

noun

def·​i·​cit ˈdef-ə-sət 

: a deficiency in amount

especially : an excess of expenses over income

Medical Definition

deficit

noun

de·​fi·​cit

ˈdef-(ə-)sət; British also di-ˈfis-ət, ˈdē-fə-sət

: a deficiency of a substance

a potassium deficit

also : a lack or impairment of a functional capacity

cognitive deficits