1 —2 uses as in: However, complications may...Definition
though (or another expression that connects contrasting ideas)
(Based on "idea 1" we might not expect "idea 2", but this is a way of saying that even though "idea 1" exists, we still have "idea 2." Synonyms include in spite of that, , nevertheless, nonetheless, on the other hand, in contrastand but.)
There was, however, no insurance.
Book Three (98% in)
I knew, however, that there had been three others.
Book One (70% in)
There are no more uses of "however" flagged with this meaning in A Farewell to Arms.