prep.
in the intervening period between (the time mentioned) and the time under consideration.
conj.
- during or in the time after.
- for the reason that; because.
adv.
- from the time mentioned until the present or the time under consideration.
- ago.
Etymology
ME: contr. of obs. sithence, or from dial. sin (both from dial. sithen ‘thereupon, afterwards, ever since’).