conceivably
adv.in a way that is possible or can be imagined. You use this to describe a situation that might happen, even if it is not very likely.
adv.in a manner that is possible or can be imagined; logically or physically feasible.
“It is conceivable that the weather will improve by tomorrow.”
“The committee considered that conceivably, the new policy could lead to a significant increase in productivity.”
“While the initial proposal seemed far-fetched, conceivably, the technology could be adapted to solve the current environmental crisis within a decade.”
“You’ll remember that he did not win that leadership election either, and nobody voted for Kendall, except, conceivably, Level 42 fans (she got 4.5%).”
From conceivable + -ly.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.