conj (also seeing that, infml 口语作 seeing as) in view of the fact that; because 由于; 因为
*Seeing (that) the weather is bad, we'll stay at home. 因为天气不好, 我们要呆在家里了.
because a particular fact or situation is true
I won't stay long, seeing as you're busy.
Oh, all right, seeing as it's you (=used to agree humorously to someone's request) .