然迄 is read as さまで (samade) and means so much.
さまで
samade
しかるがゆえに
as such
しかるうえは
now that it is as such
さこそいえ
be that as it may
さしったり
here it comes
さあり
it is so
さ
so
しか
like that
ぜん
-like
しかし
however
しぜん
nature
とうぜん
naturally
ふしぜん
unnatural