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."