1. An entry showing a debt, or expense, in a record of accounts; an accounting entry acknowledging sums that are owed.
2. The total of individual debit entries in an account: Sharon forgot to enter some of the debits in her check book.
3. Something that is disadvantageous or unfavorable: The pay may be better, but on the debit side there's a lot more work that needs to be done.
4. Etymology: from Middle French debet, from Latin debilitum, "thing owed"; past participle of debere, "to owe"; from Old French dete, from Latin debitam, "thing owed"; originally, "keep something away from someone"; from de-, "away" + habere, "to have".

An amount of money taken out of an account: Latonia's and Tony's bank account will automatically be debited for the amount of the couple's monthly rent.

Elijah's credit union account is automatically being debited each month to pay for his health insurance.