01 a. So tight as to be impermeable to air or other gases; as, an air-tight cylinder; -- said of containers.
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1.
So tight as to be impermeable to air or other gases; as, an air-tight cylinder; -- said of containers.
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2.
of such close construction as to have little leakage of air in or out; -- said of structures
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3.
so thoroughly convincing as to be insusceptible to doubt; having no apparent counterarguments; -- of arguments or assertions
Syn.
airtight, uncontradictable, undeniable.