* Noun: This is the most common usage, referring to the act of raising someone to a higher position or rank.
* Example: "She received a promotion to senior manager."
* Verb: This describes the action of advancing someone or something.
* Example: "The company is promoting its new product line."
* Adjective: This is less common, but it can be used to describe something related to promotion.
* Example: "The promotion campaign was successful."
Therefore, to determine the part of speech, you need to examine its usage within a sentence.