• IPA: /ˈsɪðəns/, /sɪˈðɛns/

sithence (not comparable)

1. (obsolete) Thereupon; subsequently, afterwards.
2. (obsolete) Since.

1. (obsolete) From or since the time that.
2. (archaic) Seeing that, since.
   • 1603, Michel de Montaigne, John Florio, transl., The Essayes, […], printed at London: By Val[entine] Simmes for Edward Blount […], OCLC 946730821 ↗:

     , Folio Society, 2006, vol.1, pp.186-7:

     Sithence it must continue so short a time, and begun so late […], there was no time to be lost.

• (from or since the time that) sithen; see also Thesaurus:since
• (seeing that) given that, sith; see also Thesaurus:because

1. (obsolete) Since.