In a dreamy manner; with a distant, imaginative, or abstracted quality; as if in a dream.
From dream + -i (the suffix used before -ly when attaching to certain nouns and verbs) + -ly (adverbial suffix). Creates an adverb describing manner or mode.
This is the natural, preferred adverb form from 'dream'—note how English inserts an extra vowel (-i-) before -ly in many words (happily, easily, dreamily) to ease pronunciation, a pattern linguists call 'epenthesis.'
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