although
UK: ɔːlˈðəʊ | US: ɔːlˈðoʊ
conj. used to introduce a statement that contrasts with or seems to contradict something that has been said previously
The word "although" originated in Middle English as a combination of "all" (emphasizing totality) and "though" (introducing contrast). Over time, the phrase "all though" merged into a single word, retaining its function of introducing a concessive clause. The logic reflects a strengthening of the contrast ("even if entirely so, still...").
Although it was raining, we decided to go for a walk.
She accepted the job, although the salary was lower than she expected.
Although he studied hard, he didn’t pass the exam.
They enjoyed the trip, although the weather was unpredictable.
Although small, the room felt cozy and inviting.