I. adverb
conceivably but not certainly so
perhaps this is true, but I think it's debatable
Synonyms: maybe, perchance, possibly
Related Word: conceivably, feasibly, imaginably
Idioms: as it may be, as the case may be, for all one knows
Contrasted words: certainly, definitely, doubtlessly, surely, undoubtedly, unquestionably
II. noun
Synonyms: theory 2, conjecture, speculation, suppose, supposition