Ambition is a strong desire to achieve. It's what Macbeth had too much of, and what slackers have too little of.
If a person has ambition, the goal is usually wealth, power, or fame. This Middle English word is derived from Latin ambitiō, from ambīre "to go around or about." In ancient Rome, candidates for office would go around to gain votes, to further their goal of being powerful or famous.