American English

Definition of sentence adverb noun from the Oxford Advanced American Dictionary


sentence adverb

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an adverb that expresses the speaker's attitude toward, 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 Learner's Dictionary entry: sentence adverb