Deficit

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late 18th century: via French from Latin deficit ‘it is lacking’, from the verb deficere (see defect1).

wiktionary

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From French déficit, from Latin dēficit.

etymonline

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deficit (n.)

"a falling short or failure in amount," especially financially, 1782, from French déficit (late 17c.), from Latin deficit "it is wanting," an introductory word in clauses of inventory, third person singular present indicative of deficere "to fail, be deficient," from de "down, away" (see de-) + combining form of facere "to do, make" (from PIE root *dhe-"to set, put").