* Noun: This is the most common usage. It refers to the meaning of a word or phrase.
* Example: "The definition of 'happy' is a state of feeling pleasure or contentment."
* Adjective: This usage describes something that is clear, precise, and specific.
* Example: "The teacher gave a definition explanation of the concept."
* Verb: This usage means to state or explain the meaning of something.
* Example: "I defined the term for the students."
It's important to look at the context to determine which part of speech the word "definition" is acting as.