—n. 1. cost or charge: the expense of a good meal. 2. a cause or occasion of spending: A car can be a great expense. 3. the act of expending; expenditure.
4. expenses, a. charges incurred during a business assignment or trip.
b. money paid as reimbursement for such charges: to receive a salary and expenses. 5. at the expense of, at the sacrifice of; to the detriment of: quantity at the expense of quality.