Operated, or activated, by placing coins in a slot.

A person who operates a telephone switchboard. / A person who provides assistance in establishing a connection, or who provides information or takes messages via the telephone.

(psychology) A technique of behavior modification through positive and negative reinforcement and positive and negative punishment.

(mathematics, physics) A differential operator,denoted ∆ and defined on ℝⁿ as 𝛥=∑ᵢ₌₁ⁿ(∂²)/(∂x_i²), used in the modeling of wave propagation, heat flow and many other applications.

A company that sells package holidays.

A subcontractor who may be a commercial carrier, but most often provides capacity (trucks and drivers, with or without trailers or chassis) to either commercial or private carriers under a contract for services.

(business, accounting) Any expense incurred in running a business, such as sales and administration, as opposed to production.

(business) The business cycle from startup of operations to the profit; from obtaining the raw material, through designing and production, to the distribution and profits.

(finance) Negative operating income.

A room in a hospital used for performing surgical operations.