Expenditure, n.
1. The act of expending; a laying out, as of money; disbursement. our expenditure purchased commerce and conquest. Burke.
2. That which is expended or paid out; expense. The receipts and expenditures of this extensive country. A. Hamilton.
Shades of meaning
Fernald has no entry of its own for expenditure; he lists it under expense, price.
Where he writes about it:
Outlay is used of some definite expenditure, as for the purchase of supplies; outgo of a steady drain or of incidental expenses. — from expense