#but they have different meanings

prokopetz:

Random linguistic observation #137: in American English, depending on the tone, expression and posture with which it’s delivered, the word “yeah” can mean any of:

• That is correct.
• I approve.
• I don’t care.
  
• I am skeptical.
• I wasn’t listening.
  
• I agree to your proposal.
  
• I require additional information.
• I support you in this undertaking.
  
• I didn’t tell you because I thought it was obvious.
  
• I recognise the truth of your words, but fail to see their relevance.
• I am a sapient jug of fruit punch.