Sith

Sith preposition , adverb , & conj. [ See Since .] Since; afterwards; seeing that. [ Obsolete] « We need not fear them, sith Christ is with us.» Latimer. « Sith thou art rightful judge.» Chaucer.
Found on http://www.encyclo.co.uk/webster/S/110

Sith

• (n.) Alt. of Sithe • (prep., adv., & conj.) Since; afterwards; seeing that.
Found on http://thinkexist.com/dictionary/meaning/sith/

sith

since
Found on http://phrontistery.info/s.html
No exact match found