All 3 Uses

although
in
The Memory Keeper’s Daughter
(Auto-generated)

The moment had passed, and although he often thought about the cool, surprising touch of her lips on his, every time he saw her David also wondered that it had ever really happened.†
p. 148.9 *

although = even though -- used to connect contrasting ideas
Last night the familiar angry voices of his parents had risen up to his room, and although they were arguing, the stone he had felt in his throat at the thought of his father lying dead somewhere, his father gone forever—immediately, that had dissolved.†
p. 278.6
He'd gone to Juilliard, and although David had given his blessing and paid half his hills, what Paul still remembered was the deeper past, when David didn't believe his talent would be enough to sustain him in the world.†
p. 321.8

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)