The quality of being ambitious; having a strong desire to succeed and achieve goals.
From 'ambitious' (desiring success, from Latin 'ambitio' meaning a going around seeking support) plus the suffix '-ness' (quality or state). The root 'ambitio' originally referred to politicians going around seeking votes.
The word 'ambitious' literally comes from Roman politicians 'going around' asking for votes and support—so ambitiousness is basically the drive that makes you actively seek out opportunities and support for your goals, just like those ancient campaigners.
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