What is the meaning of 所?

forms passive participles

place

a place, a scene, a site; an address

a figurative place that facilitates or promotes something; a point in time or state of affairs

a state of being

1. about to

   about to

   just

   indicates the current state, or how you have progressed so far in a chain of actions

   at that point in time, upon

   Attaches to verbs to form noun phrases, meaning the object of that verb.

   alternative form of 所 (tokoro)

   area, location, spot

   place, field

   Source: wiktionary.org