All 5 Uses

although
in
My Antonia
(Auto-generated)

Although Jim Burden and I both live in New York, and are old friends, I do not see much of him there.†
Book Intr. *

although = even though -- used to connect contrasting ideas
Fuchs, although he had been up in the cold nearly all night, was going to make the long ride to Black Hawk to fetch the priest and the coroner.†
Book 1
Although it was perfectly clear that Mr. Shimerda had killed himself, Jake and the coroner thought something ought to be done to Krajiek because he behaved like a guilty man.†
Book 1
She had come to us a child, and now she was a tall, strong young girl, although her fifteenth birthday had just slipped by.†
Book 1
Although I admired scholarship so much in Cleric, I was not deceived about myself; I knew that I should never be a scholar.†
Book 3

Definitions:

(1) (although)
even though -- used to introduce an idea that contrasts with or makes the main statement surprising

At the start of a sentence, although can play a role similar to words like however, yet, still, even so, on the other hand, or nonetheless—all of which signal contrast. In the middle of a sentence, although can sometimes be used where but or though might also work, but though or but often sound more natural. For example, "She's a great teacher, though not the most popular" is usually smoother than "She's a great teacher, although not the most popular."
(2) (meaning too rare to warrant focus)