Significantly means in a way that has an effect

[“significantly”, Merriam-Webster, http://www.merriam-webster.com/dictionary/significantly, accessed 8-15-15, AFB]

significantly

adverb sig·nif·i·cant·ly \sig-ˈni-fi-kənt-lē\

: in a way that is large or important enough to be noticed or have an effect

—used to say that something is important or meaningful

: in a way that has a special or hidden meaning

Full Definition of SIGNIFICANTLY

1: in a significant manner : to a significant degree <the salaries differed significantly>

2: it is significant <significantly, they were on time>