@David *******
""Merriam-Webster: visa - (noun) - an endorsement made on a passport by the proper authorities denoting that it has been examined and that the bearer may proceed." So, every stamp in your passport is a visa. By definition." . . . . . complete nonsense. A visa is an endorsement to allow ENTRY into another country. AFTER you entered, the "visa" is used or "expired". It stops existing! . . . . .your Merriam-Webster obviously is wrong!
A "visa" permits and regulates the ENTRY into the country.
Depending on the visa category, you will receive different lengths of stay permits. For Thailand, these can be 15, 30, 60, 90, or 180 days. They can also be 5, 10, or even 20 years.
The STAY PERMIT regulates STAYING in the country.
The duration of the permitted stay depends on the visa category with which you entered.
A single-entry visa becomes invalid upon entry and cannot be extended or used for another entry.
You have entered the country “on a visa” and you are now inside the country on a stay permit. This is also evident from the entry stamp:
This stamp states "admitted until" and a date. This stamp is the actual stay permit. This stamp is not a visa. The entry date is in red, and the expiration date of the "admitted until" permit is in blue.
In the upper right corner, next to the wording “visa class”, the visa category under which you entered the country is either handwritten or stamped.
If you leave the country before the expiration of your stay permit without a re-entry permit, the visa itself does not expire (because you no longer have any visa)... it is just the stay permit which expires.
The "extension of the stay permit" is not a visa. It is an “extended stay permit”.
No immigration office can extend any visas; technically, that's impossible, even though they often refer to a "visa extension" in their bad English
Unfortunately, immigration doesn't differentiate between the terms "visa" and "stay permit." They consider them one and the same. This is not correct.
However, a handful of immigration offices have seen the light and stopped talking about "visa extensions." See the image below the comment!
If I want to be clear in my visa consultations, I have to ignore the immigration office's error and use the correct terminology.
Even the "visa exemption" (visa-free entry) isn't a visa, but simply a stamped stay permit.
Lack of words also plays a role. It's easier to say you have a "retirement visa" than to use the correct term, "you got a one-year extension of the temporary stay permit based on retirement."
If someone doesn't understand this, I really can't help them; then all my efforts are in vain