Used in the pattern ～に至るまで to emphasize that something extends to an extreme or unexpected point, often translated as 'even' or 'as far as'.
We investigated thoroughly, down to the smallest detail.
He is particular about everything, even his clothing.
from ... to ...; everything from ... to ...
Used in the pattern ～から～に至るまで to list a range, often implying comprehensiveness or variety.
It's an event that everyone can enjoy, from children to adults.
I was covered in mud from head to toe.
Standard modern spelling.
Contains the outdated kanji 迄; rarely used in modern writing.
Combination of the verb 至る (to reach, to arrive at) and the particle まで (until, as far as). The phrase literally means 'reaching as far as' and is used to emphasize extent or range.