Main Entry: air·tight

Pronunciation: \ˈer-ˌtīt\

Function: adjective

Date: 1760

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>

— air·tight·ness noun