adverb

definitely

definitely, certainly, without a doubt

I will definitely be there.

I will definitely be there.

This is definitely the best cake I've ever had.

This is definitely the best cake I've ever had.

((to definitely do sth.)) used to emphasize that something is true or will happen. I will definitely be there.

Synonyms: certainly, absolutely, undoubtedly; Antonyms: possibly, maybe, perhaps

From the adjective 'definite' + the adverb-forming suffix '-ly'.

If something is 'definite' (certain), you do it 'definitely' (with certainty). It's the adverb form.

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