am ‧ bi ‧ tious /æmˈbɪʃəs/ BrE AmE adjective
1 . determined to be successful, rich, powerful etc:
Alfred was intensely ambitious, obsessed with the idea of becoming rich.
ambitious for
mothers who are highly ambitious for their children (=who want their children to be successful)
2 . an ambitious plan, idea etc shows a desire to do something good but difficult:
an ambitious engineering project
an over-ambitious health reform program
—ambitiously adverb
—ambitiousness noun [uncountable]