airtight

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Definitions from WordNet

Adjective airtight has 2 senses

airtight, air-tight - having no weak points; "an airtight defense"; "an airtight argument"
Antonym: vulnerable (indirect, via invulnerable)
airtight, air-tight, gas-tight - not allowing air or gas to pass in or out
Antonym: leaky (indirect, via tight)

Definitions from the Web

Airtight

Definition:

Adjective: Impermeable to air or any other gas.

Adjective: Securely sealed so that no air or gas can enter or escape.

Adjective: Informal term meaning convincing or unassailable.

Adverb: In an airtight manner; hermetically.

Examples:

Adjective:

The airtight container kept the food fresh for an extended period.
Make sure the doors and windows are airtight to prevent drafts.
The airtight argument presented in the court convinced the jury.

Adverb:

The package was sealed airtight to maintain its freshness during shipping.
The windows in the submarine are designed to close airtight when underwater.

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