All 3 Uses

although
in
The Lovely Bones
(Auto-generated)

Although the eldest in my family and good at acing a science quiz, I had never felt comfortable with adults.†
Chpt 1 *

although = even though -- used to connect contrasting ideas
"I understand," he said first, although he didn't.†
Chpt 5
Although Ray had been accused of being involved in my disappearance, he had understood why, knew that the police were doing their job.†
Chpt 21

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)