1. Noun: When referring to the information or data that is put into a system or process.
* Example: "The input for the computer program was a list of names."
2. Verb: When it means to enter information or data into a system or process.
* Example: "Please input your password."
3. Adjective: While less common, it can sometimes be used as an adjective to describe something that is given or provided as input.
* Example: "The input device was a keyboard."
So, to figure out the part of speech, you need to look at how the word is used in the sentence!