What part of speech is the word first?

The word "first" can be a few different parts of speech, depending on its function in the sentence:

* Adjective: Describing a noun. Example: "This is my first time trying sushi."

* Adverb: Modifying a verb, adjective, or another adverb. Example: "I first met her at the library."

* Noun: Referring to the number one in a sequence. Example: "He came in first place."

* Pronoun: Replacing a noun, usually referring to something previously mentioned. Example: "Which one do you want? I'll take the first."

To determine the part of speech of "first" in a specific sentence, consider how it's being used and what it's modifying.