expense-n; 3 Senses

Sense Number 1: cost, amount of money paid

Commentary: EXPENSE[+quantity][+amount][+money]
NOTE: 'expense' can be paraphrased with an amount of currency.

The expense of repairing the tunnel will be about thirty million dollars.
John worried about the expense of hiring two full time employees.
Their moving expenses came to just under five thousand dollars.
The operating expense of that airline is preventing it from being profitable.

WordNet 3.0 Sense Numbers: 1, 3

Sense Number 2: a trade off, sacrifice

Commentary: EXPENSE[+relation][+trade_off]

They are fostering the students' self-esteem at the expense of their intellectual development.
At the expense of seeming rude, Sally told the man to speak more quietly on his cell phone.

WordNet 3.0 Sense Numbers: 2

Sense Number 3: a thing which costs money

Commentary: EXPENSE[+entity][+purchase]
NOTE: there is an explicit or implied noun referenced by 'expense'

Mary decided the country house was an expense she couldn't afford.
He gives his son an allowance for his school expenses.
Dental cleanings and eyeglasses are not classified as medical expenses under this policy.

WordNet 0.0 Sense Numbers: 3