Albeit is a small, rather careful word you use to add a point that pulls the last thing you said down a little. It means something like “although” or “even if,” but it usually stays inside the sentence instead of opening a big new one: “The film was good, albeit long.” “She agreed, albeit reluctantly.” You will meet it in writing more than in playground talk. It likes to sit in front of an adjective or an adverb more than in front of a whole clause with its own verb, though you will see both. It is not warmer or colder than “although”; it is just tighter and a bit more formal. Though actually, if you use it in every sentence it starts to sound like you are wearing a tie to breakfast.