cost or charge

the expense of a good meal.

a cause or occasion of spending

A car can be a great expense.

the act of expending; expenditure.

expenses,

charges incurred during a business assignment or trip.

money paid as reimbursement for such charges

to receive a salary and expenses.

to charge or write off as an expense.

to be expensed. ?

at the expense of

at the sacrifice of; to the detriment of

quantity at the expense of quality.

noun

cost of living , per diem , reparations , damages , outlay , overhead , costs