Meaning

• Eager or inordinate desire for some object that confers distinction, as preferment, honor, superiority, political power, or literary fame; desire to distinguish one's self from other people.

  "My son, John, wants to be a firefighter very much. He has a lot of ambition."

• An object of an ardent desire.

  "My ambition is to own a helicopter."

• A desire, as in (sense 1), for another person to achieve these things.

• A personal quality similar to motivation, not necessarily tied to a single goal.

• The act of going about to solicit or obtain an office, or any other object of desire; canvassing.

Meaning

• To seek after ambitiously or eagerly; to covet.

  "Pausanias, ambitioning the sovereignty of Greece, bargains with Xerxes for his daughter in marriage. — Trumbull."