Definitions from Wiktionary (ambition)

▸ noun:  (uncountable, countable) Eager or inordinate desire for some object that confers distinction, as preferment, honor, superiority, political power, or fame; desire to distinguish one's self from other people.
▸ noun:  (countable) An object of an ardent desire.
▸ noun:  A desire, as in (sense 1), for another person to achieve these things.
▸ noun:  (uncountable) A personal quality similar to motivation, not necessarily tied to a single goal.
▸ noun:  (obsolete) The act of going about to solicit or obtain an office, or any other object of desire; canvassing.
▸ verb:  To seek after ambitiously or eagerly; to covet.

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