It is a part (with an incomplete meaning) of a word. When combined with another part(s) a word is made with a complete meaning. The incomplete meaning of ki changes depending on the other part(s).
Ki is always a part. Everything in universe is a part of something bigger, related to each other.
I think Ki is in a partitive case, as in language you have different cases: nominative, accusative, genitive, but also partitive.
It exists in Finnish Language.
That means that you don't use the whole Ki from your body/partner/universe,... but a part of it at once.
Like: if you watch television, you watch television the partitive way: you only watch the screen, not the whole television.
Puhun vahan suomea