adverbial disjunct
Definition - An adverb that modifies either a whole sentence or an independent clause.

1. It conveys the speaker's overall mood, sentiments, or attitude. It does not modify a particular verb, adjective, or adverb within a sentence.

Example -

(1) Hopefully, he'll be back by midnight.
Translation: I hope he'll be back by midnight.
(2) Fortunately, he had already decided to kiss her.

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