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]