Easily is defined as with little or no trouble, or very likely, or by far.
(adverb)
An example of easily used as an adverb is in the sentence, "We easily put the puzzle together," which means that we put the puzzle together without any trouble.
An example of easily used as an adverb is in the sentence, "She is easily the most beautiful girl in the pageant," which means that she is, by far, the most beautiful girl in the pageant.