Learner's definition of ALTHOUGH
1 : despite the fact that : though — used to introduce a fact that makes another fact unusual or surprising
Although [=while, even though] he was hungry, he could not eat.
Although we rarely see each other, we're still very good friends. = We're still very good friends although we rarely see each other.
Although [=while] I'd love to have dinner with you tonight, I already have plans.
It feels as if I've known you forever although [=even though] we've only known each other for a day.
He's the basketball team's best player although he's the shortest one on the team.
Although (it is) small, the apartment is very expensive.
2 : but however though — used when making a statement that differs from or contrasts with a statement you have just made
I don't believe we've met before, although I must say you do look very familiar.
I think his name is John, although I'm not completely sure about that.
I'd love to have dinner with you, although I can't.
The book had a good, although not great, plot.