* Noun: This is the most common use. It refers to a firm decision to do something.
* Example: "She made a New Year's resolution to eat healthier."
* Adjective: It can describe something that is determined or firm.
* Example: "The team had a resolution to win the championship."
* Verb: It can mean to settle or resolve a problem or disagreement.
* Example: "They were able to resolve their differences."
So, the part of speech depends on the specific sentence and how the word is being used.