Artificial intelligent assistant

air-tightly

air-tightly, adv.
  (ˈɛəˌtaɪtlɪ)
  [f. air-tight a. + -ly2.]
  In an air-tight manner.

1800 Howard in Phil. Trans. XC. 238 By means of a leather collar, the neck can be air-tightly closed.

Oxford English Dictionary

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