What part of speech is concentration?

"Concentration" can be a few different parts of speech, depending on how it's used in a sentence:

* Noun: This is the most common usage. It refers to the act of focusing your attention.

* Example: "She needed complete concentration to solve the puzzle."

* Adjective: This usage is less common, but still valid. It means "focused" or "intense."

* Example: "He gave a concentration stare at the board."

Let me know if you have a specific sentence in mind and I can help you determine the part of speech for "concentration" in that context!