1. Noun: This is the most common usage. It refers to a group of things that are connected or related in some way, like a series of books, a series of events, or a series of numbers.
* Example: "He watched the entire series of movies."
2. Adjective: This is less common, but it can be used to describe something that is arranged in a series or sequence.
* Example: "The series of events led to the conclusion."
3. Verb: This is even less common, but it can be used in a few specific contexts, such as:
* Example: "The company series its products into different categories."
To determine the part of speech, look at the context of the sentence and consider how the word is being used.