What does "hermetically" mean?

In a hermetic way.; With a hermetic seal; so as to be airtight.

What is a synonym for "hermetically"?

Common synonyms include: airtightly, impenetrably, impermeably, insularly.

Pronounced //hɚˈmɛt.ɪk(.ə)li//.

/hɚˈmɛt.ɪk(.ə)li/ adv

adv ·Rare ·Advanced level

Adverb

1
In a hermetic way.; With a hermetic seal; so as to be airtight.
"a hermetically sealed jar"
2
In a hermetic way.; In an isolated manner.
"living hermetically"

Adverb

"The pressure cooker is a cooking utensil that closes hermetically."

From hermetic + -ally.