The term that defines a power shared by both state and federal governments is **concurrent**.
1. **Concurrent powers** are powers that are shared by both levels of government, meaning that both the state and federal governments have the authority to exercise these powers simultaneously within their jurisdictions.
2. Examples of concurrent powers include the power to collect taxes, establish courts, and regulate commerce. These powers can be exercised independently by both state and federal governments, which can sometimes lead to overlapping regulations or conflicts that need to be resolved through legal means.
3. On the other hand, **expressed powers** are specifically granted to the federal government by the U.S. Constitution, while **implied powers** are those that are not explicitly stated but are reasonably inferred from the Constitution. **Reserved powers** are powers that are specifically reserved for the states according to the Tenth Amendment of the Constitution.
In summary, **concurrent powers** refer to those shared by both state and federal governments, highlighting the ability of both levels of government to exercise authority over certain issues within their jurisdictions simultaneously.