seeing

Etymology 1

see + -ing

verb

1. present participle and gerund of see
   Seeing the British establishment struggle with the financial sector is like watching an alcoholic who still resists the idea that something drastic needs to happen for him to turn his life around. 2013-06-28, Joris Luyendijk, “Our banks are out of control”, in The Guardian Weekly, volume 189, number 3, page 21

adj

1. Having vision; not blind.

noun

1. The action of the verb to see; eyesight.
   To such perceivings we give names like these: seeings, hearings, smellings, chillings and burnings, pleasures and pains, desires […] 2004, Timothy D. J. Chappell, Reading Plato's Theaetetus, page 73
2. (astronomy) The movement or distortion of a telescopic image as a result of turbulence in the Earth's atmosphere.

Etymology 2

Probably an elision of "seeing that" or "seeing as".

conj

1. (slang) Inasmuch as; in view of the fact that.
   Seeing the boss wasn't around, we took it easy.