We Found 4 Definitions for
adjective - Used as a modifier before a noun: my boots; my accomplishments.
adjective - Used preceding various forms of polite, affectionate, or familiar address: My friend, you are so right.
adjective - Used in various interjectional phrases: My word! My goodness!
interjection - Used as an exclamation of surprise, pleasure, or dismay: Oh, my! What a tiring day!