air·​tight | \ ˈer-ˌtīt How to pronounce airtight (audio) \

Definition of airtight

1 : impermeable to air or nearly so an airtight seal
2a : having no noticeable weakness, flaw, or loophole an airtight argument
b : permitting no opportunity for an opponent to score an airtight defense

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Other Words from airtight

airtightness noun

Examples of airtight in a Sentence

Store the food in an airtight container. The defendant had an airtight alibi.

Recent Examples on the Web

Store in an airtight container in the refrigerator. Nazima Qureshi, SELF, "5 Energizing, Plant-Based Dishes This R.D. Relies on During Ramadan," 3 May 2019 Although there were some airtight compartments when the ship went down much of it including the guns, engines, electronics, and other critical components were submerged in corrosive seawater for nearly four months. Kyle Mizokami, Popular Mechanics, "Watch Salvagers Raise a Sunken Norwegian Frigate," 5 Mar. 2019 That money also could have been redirected to help people make these homes more airtight with better insulation or replacement of leaky windows and doors. WSJ, "Well-Sited Wind Towers Make Good Sense," 11 Feb. 2019 The case against him would have to be airtight and based on indisputable fact. Ted Van Dyk, WSJ, "To Beat Trump, Get a Grip," 23 July 2018 Make sure the connection between the balloon and tube is airtight. Svenja Lohner, Scientific American, "Floating with a Swim Bladder," 5 July 2018 This newfound access for third-party developers comes at a time when data privacy is top of mind for some consumers as well as legislators, and Snap is going to great lengths in its outreach around Snap Kit to assure people the platform is airtight. Lauren Goode, WIRED, "Snap Will Let Other Apps Use Its Features, But Not Your Data," 14 June 2018 And, as the example of the creepy Facebook engineer shows, the policies that exist are hardly airtight. Jeff John Roberts, Fortune, "Facebook, Uber and the Trouble With "God View"," 12 May 2018 The cryptography securing the network needs to be airtight. The Economist, "New ways to trade data," 28 Mar. 2018

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.

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First Known Use of airtight

1728, in the meaning defined at sense 1

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Dictionary Entries near airtight


air tanker

air taxi





Statistics for airtight

Last Updated

6 May 2019

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Time Traveler for airtight

The first known use of airtight was in 1728

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English Language Learners Definition of airtight

: tightly sealed so that no air can get in or out
: too strong or effective to fail or to be defeated


air·​tight | \ ˈer-ˈtīt How to pronounce airtight (audio) \

Kids Definition of airtight

: so tightly sealed that no air can get in or out Store the cookies in an airtight container.

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More from Merriam-Webster on airtight

Rhyming Dictionary: Words that rhyme with airtight

Spanish Central: Translation of airtight

Nglish: Translation of airtight for Spanish Speakers

Comments on airtight

What made you want to look up airtight? Please tell us where you read or heard it (including the quote, if possible).


a sum of money that is sent as a payment

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