During what time frame did the notion that more than 3-Dimensions may exist become accepted?

At this site there is a history of dimensionality.

http://scholar.uwinnipeg.ca/courses/38/4500.6-001/Cosmology/dimensionality.htm

To find out the time frame during which the notion that more than three dimensions may exist became accepted, you can visit the provided website. Here are the steps to follow:

1. Open a web browser on your device.
2. Copy and paste the URL "http://scholar.uwinnipeg.ca/courses/38/4500.6-001/Cosmology/dimensionality.htm" into the address bar.
3. Press Enter or Return to load the webpage.
4. Once the webpage has loaded, you will be presented with a history of dimensionality.
5. Scroll through the webpage to find the relevant information about the acceptance of more than three dimensions.

The website should provide information about the time frame when the notion of more than three dimensions started to gain acceptance.