1. An achievement that requires great skill, courage, or strength:
* Example: "The climber's ascent of Mount Everest was an incredible feat."
2. A remarkable or noteworthy act:
* Example: "The magician performed a feat of sleight of hand."
3. (archaic) A clever trick or act of deception:
* Example: This usage is less common today, but you might see it in older literature.
In short, "feat" usually refers to something impressive and difficult to achieve.