Webster's Revised Unabridged Dictionary · 1913

Maybe

Maybe , adverb

[For it may be.]

Perhaps; possibly; peradventure.
Maybe the amorous count solicits her. — Shakespeare
In a liberal and, maybe, somewhat reckless way. — Tylor

Maybe , adjective

Possible; probable, but not sure. [Rare]
Then add those maybe years thou hast to live. — Driden

Maybe , noun

Possibility; uncertainty. [Rare]
What they offer is mere maybe and shift. — Creech