valley. (building construction). An inside angle formed where two sloping sides intersect. (geography). A generally broad area of flat, low-lying land bordered by higher ground.
In ordinary usage, price is the quantity of payment or compensation given by one party to another in return for goods or services.
Definition of cost for English Language Learners. : 1  to have (an amount of money) as a price. : 2  to cause (someone) to pay an amount of money. : 3  to cause (someone) to lose something.