Although is used to admit one thing while stating another. Although it rained, although he tried, although late.
It concedes: although names the thing that might have argued the other way. It is slightly more formal than though and cannot be used at the end of a sentence, where though can — he came, though. Note that the word is all plus though, so the all was originally emphatic.
1prepositionalthoughUsed to admit one thing while stating another.
“Although it was raining, we still went for a walk along the beach.”
although is a connecting word.
Middle English althagh is all plus though, with all as an intensifier. Though comes from Old Norse.
Middle English
althagh
English, today
although
Built from
From Middle English althagh, from Old English -, from und + eall. From Middle English althagh, from Old English - compound of eall (“all (emphatic)”) + þēah (“though”). by surface analysis, al(l) + all + though.
Etymology from Wiktionary, CC BY-SA