* Noun: This is the most common usage. It refers to the feeling of gratitude or pleasure.
* Example: "She expressed her appreciation for the gift."
* Verb: This is less common but possible. It means to understand or value something.
* Example: "I appreciate your honesty."
* Adjective: This is even less common but can be used in some contexts. It means showing appreciation.
* Example: "She gave an appreciative nod."
It's important to look at the context of the sentence to determine the part of speech.