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• a hard return hitting the tennis ball above your head

  synonym	smash
  hypernym	return

• (nautical) the top surface of an enclosed space on a ship

  domain topic	navigationsailingseafaring
  holo part	cabin
  hypernym	ceiling

• a transparency for use with an overhead projector

  synonym	viewgraph
  hypernym	foiltransparency

• (computer science) the disk space required for information that is not data but is used for location and timing

  synonym	disk overhead
  domain topic	computer sciencecomputing
  hypernym	disc spacedisk space

• 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

  synonym	budget itemsoperating costoperating expense
  domain topic	revenue enhancementtaxtaxation
  holo part	operating budget
  hypernym	disbursaldisbursementexpense

• (computer science) the processing time required by a device prior to the execution of a command

  synonym	command overheadcommand processing overheadcommand processing overhead time
  domain topic	computer sciencecomputing
  holo part	access time
  hypernym	processing time

• located or originating from above

  antonym

  subsurfacesurface

• above the head; over the head
• above your head; in the sky