Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The volume left at the top of an almost filled jar, tin, or other container before sealing.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The space between the top of the contents of a container (such as a jar) and its seal (such as a lid).
  • n. One's mental state.
  • n. The gap between the face of the bolt and the stopping surface for the cartridge.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the volume left at the top of a filled container (bottle or jar or tin) before sealing

Etymologies

head +‎ space (Wiktionary)

Examples

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