Definition of "Overhead" :
noun: a hard return hitting the tennis ball above your head
noun: (nautical) the top surface of an enclosed space on a ship
noun: a transparency for use with an overhead projector
noun: (computer science) the disk space required for information that is not data but is used for location and timing
noun: 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
noun: (computer science) the processing time required by a device prior to the execution of a command
adjective: located or originating from above
"An overhead crossing."
adverb: above the head; over the head
"Bring the legs together overhead."
adverb: above your head; in the sky
"Planes were flying overhead."