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Definition of Airtight
1. Adjective. Having no weak points. "An airtight argument"
2. Adjective. Not allowing air or gas to pass in or out.
Definition of Airtight
1. a. So tight as to be impermeable to air; as, an air-tight cylinder.
2. n. A stove the draft of which can be almost entirely shut off.
Definition of Airtight
1. Adjective. Being impermeable to air or other gases. ¹
2. Adjective. (figuratively) Having no weak points or flaws (as in an "airtight" argument). ¹
¹ Source: wiktionary.com
Definition of Airtight
1. not allowing air to escape or enter [adj]