Definitions

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

  • adj. Impermeable by air.
  • adj. Having no weak points; sound: an airtight excuse.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Being impermeable to air or other gases.
  • adj. Having no weak points or flaws (as in an "airtight" argument).

Etymologies

air +‎ tight (Wiktionary)

Examples

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