Definitions

1. interjection

an expression used to show agreement or assent, typically used in response to a request or instruction, especially in military or formal contexts

“The soldier replied, ‘Yessir,’ and followed the officer’s order.”

2. noun

a term used to refer to a person in a position of authority or respect

“The police officer was addressed as ‘yessir’ by the young recruit.”

3. adverb

used to emphasize agreement or assent

“He said ‘yessir’ firmly, showing his determination to follow the plan.”