airtight

adjective

air·​tight ˈer-ˌtīt 

1

: impermeable to air or nearly so

an airtight seal

2

a

: having no noticeable weakness, flaw, or loophole

an airtight argument

b

: permitting no opportunity for an opponent to score

an airtight defense

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

These passed our leak test, but our avocado browned quite a bit overnight, suggesting that these containers aren’t entirely airtight. — Lizzy Briskin, Peoplemag, 9 Sep. 2024

The plastic containers are airtight to keep your food fresh, and each dispenser has adjustable portion-control settings so there’s no overpouring. — Clint Davis, People.com, 3 July 2025

Raye and the platoon of ace musicians joining her are as vocally and musically airtight as possible. — Melissa Ruggieri, USA Today, 27 Apr. 2026

Natural corks, while not entirely airtight, typically allow only a minimal amount of oxygen to enter over time. — Roger Dooley, Forbes, 12 Dec. 2024

Word History

First Known Use

1719, in the meaning defined at sense 1

Rhymes for airtight

• affright
• albite
• alight
• alright
• aplite
• aright
• bainite
• birthright
• bobwhite
• bornite
• bullfight
• calcite

Kids Definition

airtight

adjective

air·​tight -ˈtīt 

1

: so tightly sealed that no air can get in or out

an airtight container

2

: too strong or effective to fail or be defeated

an airtight argument