Definition of airtight
- an airtight seal
- an airtight argument
- an airtight defense
Store the food in an airtight container.
The defendant had an airtight alibi.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'airtight.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
: tightly sealed so that no air can get in or out
: too strong or effective to fail or to be defeated
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