Definition of "sith"

sith¹

/siːθ/

noun
plural siths
1. (obsolete) A journey, way.
  Quotations
  The holy gost before vs glad / ffull softly on his sithe(please add an English translation of this quotation)
  15th c., “Thomas Indie [Thomas of India]”, in Wakefield Mystery Plays; Re-edited in George England, Alfred W. Pollard, editors, The Towneley Plays (Early English Text Society Extra Series; LXXI), London: […] Oxford University Press, 1897, page 340, line 85
2. (obsolete) One's journey of life, experience, one's lot, also by extension life, lifetime.
3. (obsolete) An instant in time, a point in time or an occasion.
  Quotations
  Of them the other philosophers have, by siths, taken their beginning.
  a. 1450, Secretum Secretorum in Ashmole
  The foolish man thereat woxe wondrous blith, / As if the word so spoken, were halfe donne, / And humbly thanked him a thousand sith, / That had from death to life him newly wonne.
  1590, Edmund Spenser, The Faerie Queene, book 3, canto X, stanza 33
  His land mortgag'd, he, sea-beat in the way, / Wishes for home a thousand siths a day.
  1598, Joseph Hall, Quid placet ergo?, line 79

sith²

/sɪθ/

conjunction
1. Archaic form of since.
  Quotations
  Therefore we need not fear them, sith Christ is with us.
  1552, Hugh Latimer, “Sermon 27: Epistle for Twenty-First Sunday After Trinity”, in Sermons of Hugh Latimer, Cambridge University Press, published 1844, page 494
  Sith nor th'exterior nor the inward man / Resembles that it was.
  1602, William Shakespeare, Hamlet, act 2 scene 2, lines 6–7
  Therefore, as I live, saith the Lord GOD, I will prepare thee unto blood, and blood shall pursue thee: sith thou hast not hated blood, even blood shall pursue thee.
  1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], Ezekiel 35:6