Definition of airtightly in English:

airtightly

adverb

  • So as to be impermeable to air; in a manner that ensures impermeability to air. Also figurative: faultlessly.

Origin

Early 19th century; earliest use found in Edward Howard (d. 1841), novelist. From airtight + -ly.

Pronunciation

airtightly

/ˈɛːˌtʌɪtli/