the "14" in "14nm" does not refer to any particular dimension. Most structures in an 14nm chip are quite a bit larger than 14nm. It has been many years since the X in "Xnm" actually measured anything.

eg: https://www.extremetech.com/wp-content/uploads/2017/03/Slide...

More details exist online, for example this writeup: https://www.extremetech.com/computing/246902-intel-claims-th...