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

Answer 1

The notion that more than three dimensions may exist gained traction in the early 20th century, particularly with the development of theories in physics and mathematics. Albert Einstein's theory of general relativity, published in 1915, hinted at the complexities of spacetime, suggesting a four-dimensional continuum. Later, string theory in the 1980s proposed the existence of additional spatial dimensions beyond the familiar three, further solidifying the acceptance of higher-dimensional frameworks in theoretical physics.