In Thai, "khun" can have different meanings depending on the context. Here are the different meanings of "khun" in Thai:

• Golden Shower Tree: "Khun" (คูน, long vowel, middle tone) is the colloquial Thai name for the Golden Shower Tree.
• Courtesy title: "Khun" (คุณ, short vowel, middle tone) is a common Thai honorific used to show respect when addressing someone, similar to "Mr.", "Mrs.", or "Miss" in English. It is used for both men and women, married or single, unless they carry a higher degree, such as doctor.
• Noble title: "Khun" (ขุน, short vowel, rising tone) is a former royally bestowed Thai noble title.
• Place name: "Khun" is also the name of a village in Bushehr Province, Iran.

It is important to note that "khun" is a sign of respect in Thai culture, and Thais value respect highly. Therefore, it is important to use "khun" when addressing someone in a polite and respectful manner.