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Definition of airtight

airtight

/ˈɛr.taɪt/
air · tight
Adverb:airtightly
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airtight Lexical Profile

airtight Game Scores & Validity

• adjective

1

Not allowing air or gas to enter or escape; tightly sealed.

Example

"Store the roasted coffee beans in an airtight container to preserve their freshness."

2

Having no weaknesses, flaws, or loopholes that could be challenged or exploited (especially of an alibi, argument, or contract).

Example

"The defense attorney presented an airtight alibi supported by security camera footage and multiple witnesses."

Synonyms
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Antonyms
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• Nearby Words

airstream
airstrike
airstrip
airtight
airtightness
airtime
airwave

Word Origin & Etymology

Formed in the mid-18th century as a compound of "air" (from Old French air, ultimately from Ancient Greek aēr) and "tight" (from Middle English thight, of Old Norse origin). The figurative sense referring to an unassailable argument or alibi emerged in the early 20th century.

Cite this Entry

Wordmom. (2026). Definition of Airtight. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/airtight
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