n the expense of maintaining property (e.g., paying property taxes and utilities and insurance); it does not include depreciation or the cost of financing or income taxes n (computer science) the processing time required by a device prior to the execution of a command n (computer science) the disk space required for information that is not data but is used for location and timing n a transparency for use with an overhead projector n (nautical) the top surface of an enclosed space on a ship n a hard return hitting the tennis ball above your head