moonshot - definition and synonyms

noun
  1.   From our crowdsourced Open Dictionary
    1
    the sending of a spacecraft to the moonSubmitted from United Kingdom on 28/05/2015
  2.   From our crowdsourced Open Dictionary
    2
    a radical and adventurous idea

    Google is ... working on 'moonshot' ideas that could become its next source of growth, as its search-advertising business starts to slow.

    Submitted from United Kingdom on 28/05/2015