Conceivably means as could just possibly be imagined. Could conceivably happen, conceivably true, not conceivably.
It concedes bare possibility and nothing more, which is why it is nearly always a way of dismissing something politely. It sits below possibly and well below probably in any careful writer's ladder.
1adverbconceivablyAs could just possibly be imagined.
“The storm could conceivably reach the coast by tomorrow night.”
conceivably is a manner.
Proto-Indo-European
*kap-
Middle English
conceyvable
English
conceivable
English, today
conceivably
From conceivable + -ly. conceivable comes from Middle English conceyvable, equivalent to conceive + -able.
Etymology from Wiktionary, CC BY-SA