Inasmuch as; in view of the fact: Seeing that you're already at the door, I suppose I must invite you inside. (conjunction)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "seeing" in a sentence
"Get into the habit of seeing, _observing_, things -- your eyesight must never be resting, but must be continually glancing around, in every direction, and _seeing_ different objects."
"What I'm most interested in seeing is how much corporate money makes a difference in this November as well as in 2012."
"I might check out the Godfather on Blur-Ray, but what I am most interested in seeing is Casablanca."