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 of deficit

• 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

Extending assistance to children braving learning hindrances, such as ADHD (Attention-deficit/hyperactivity disorder), dyslexia, and executive dysfunction, the program aims to offer support to the aspiring young scholars in need. —Nia Bowers, USA Today, 4 Dec. 2025

The Gophers held Indiana without a field goal for the final four minutes of the first half, taking a 27-19 deficit to a 33-33 tie at the break. —Andy Greder, Twin Cities, 4 Dec. 2025

Boston outscored New York 37-20 in the frame to turn a 14-point deficit into a six-point halftime lead. —Zack Cox, Boston Herald, 4 Dec. 2025

And finally, there was the 14-0 first-quarter deficit the Mustangs faced in last week’s semifinal against Mountain Vista. —Kyle Newman, Denver Post, 4 Dec. 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