From The Collaborative International Dictionary of English v.0.48 :
Although \Al*though"\, conj. [All + though; OE. al thagh.]
Grant all this; be it that; supposing that; notwithstanding;
though.
[1913 Webster]
Although all shall be offended, yet will not I. --Mark
xiv. 29.
[1913 Webster]
Syn: Although, Though.
Usage: Although, which originally was perhaps more emphatic
than though, is now interchangeable with it in the
sense given above. Euphonic consideration determines
the choice.
[1913 Webster]