CONCEIVABLY
conceivably
(adverb) within the realm of possibility; “the weather may conceivably change”
Source: WordNet® 3.1
Etymology
Adverb
conceivably (comparative more conceivably, superlative most conceivably)
In a conceivable manner; possibly.
Source: Wiktionary
CONCEIVABLE
Con*ceiv"a*ble, a. Etym: [Cf. F. concevable.]
Definition: Capable of being conceived, imagined, or understood. "Any
conceivable weight." Bp. Wilkins.
It is not conceivable that it should be indeed that very person whose
shape and voice it assumed. Atterbury.
– Con*ceiv"a*ble*ness, n.
– Con*ceiv"a*bly, adv.
Source: Webster’s Unabridged Dictionary 1913 Edition