from The American Heritage® Dictionary of the English Language, 4th Edition

  • conj. Inasmuch as; in view of the fact: Seeing that you're already at the door, I suppose I must invite you inside.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. Present participle of see.
  • adj. Having vision; not blind.
  • n. The action of the verb to see; eyesight.
  • n. The movement or distortion of a telescopic image as a result of turbulence in the Earth's atmosphere.
  • conj. Inasmuch as; in view of the fact that.

from the GNU version of the Collaborative International Dictionary of English

  • In view of the fact (that); considering; taking into account (that); insmuch as; since; because; -- followed by a dependent clause.

from The Century Dictionary and Cyclopedia

  • Because; inasmuch as; since; considering; taking into account, or in view of the fact (with that expressed or understood).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. normal use of the faculty of vision
  • adj. having vision, not blind
  • n. perception by means of the eyes


see +‎ -ing (Wiktionary)
Probably an elision of "seeing that" or "seeing as". (Wiktionary)



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