Albeit means although or even if. Albeit briefly, albeit with reservations, a win albeit a narrow one.
It introduces a concession without a full clause, which is what makes it useful: albeit briefly says although it was brief in two words. It is one word, made from all be it, and writing it as three is a mistake.
1prepositionalbeitAlthough; even if.
“The old car still runs, albeit rather noisily.”
albeit is a connective.
A contraction of the Middle English phrase al be it, meaning although it be.
Built from
From the Middle English - expression al be it (that), itself shortened from althagh it be that (“although it be that”), and thus composed from al + be + it.
Etymology from Wiktionary, CC BY-SA