* Noun: This is the most common usage, referring to the act of rotating or the state of being rotated.
* Example: "The Earth's rotation causes day and night."
* Verb: This is less common but can be used as a noun in some cases.
* Example: "They rotated the tires on the car."
* Adjective: While uncommon, "rotation" can sometimes be used as an adjective to describe something related to rotating.
* Example: "The rotation speed of the engine is very high."
So, the part of speech of "rotation" depends on the specific context of the sentence.