English

Definition of sentence adverb noun from the Oxford Advanced Learner's Dictionary

 

sentence adverb

 noun
noun
BrE
 
; NAmE
 
(grammar)
 
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an adverb that expresses the speaker’s attitude towards, or gives the subject of, the whole of the rest of the sentence In ‘Luckily, I didn't tell anyone’ and ‘Financially, we have a serious problem’, ‘luckily’ and ‘financially’ are sentence adverbs.
See the Oxford Advanced American Dictionary entry: sentence adverb