Although Definition

ôl-thō

conjuntion

Regardless of the fact that; even though.

Although the room is big, it won't hold all that furniture.

American Heritage

In spite of the fact that; granting that; though.

Webster's New World

But; however.

He says he has a dog, although I've never seen it.

American Heritage

Though, even though, in spite of the fact that: introducing a clause that expresses a concession.

Although it was very muddy, the football game went on.

Wiktionary

It was difficult, although not as difficult as we had expected.

Wiktionary

Synonyms:

Origin of Although

From Middle English, from Old English althagh, compound of eall (“all (emphatic)”) + þeah (“though”)

From Wiktionary
Middle English al all all though though though

From American Heritage Dictionary of the English Language, 5th Edition