1. The quality of being shrewd or having intelligence which is manifested by being astute; for example, as in business dealings, politics, etc.: "My cousin's shrewdness in buying a house just before property prices started to rise saved him a lot of money."
2. Possessing, or based on, a clear understanding and good judgment of a situation, resulting in an advantage: "Her shrewdness helped her make the right financial investments."
3. An aggregation, or group, of apes.