We found one dictionary that defines the word on which:

Phrases: The empire on which the sun never sets, away between places on which to travel, board on which instruments are fixed, the basis on which something stands, a toy on which one can top, more... ▸ Words similar to on which ▸ Usage examples for on which ▸ Idioms related to on which ▸ Wikipedia articles (New!) ▸ Words that often appear near on which ▸ Rhymes of on which ▸ Invented words related to on which