The Collaborative International Dictionary of English v.0.48:

May \May\ (m[=a]), v. [imp. Might (m[imac]t)] [AS. pres. maeg
   I am able, pret. meahte, mihte; akin to D. mogen, G.
   m["o]gen, OHG. mugan, magan, Icel. mega, Goth. magan, Russ.
   moche. [root]103. Cf. Dismay, Main strength, Might. The
   old imp. mought is obsolete, except as a provincial word.]
   An auxiliary verb qualifying the meaning of another verb, by
   expressing:
   (a) Ability, competency, or possibility; -- now oftener
       expressed by can.
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             How may a man, said he, with idle speech,
             Be won to spoil the castle of his health!
                                                  --Spenser.
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             For what he [the king] may do is of two kinds; what
             he may do as just, and what he may do as possible.
                                                  --Bacon.
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             For of all sad words of tongue or pen
             The saddest are these: "It might have been."
                                                  --Whittier.
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   (b) Liberty; permission; allowance.
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             Thou mayst be no longer steward.     --Luke xvi. 2.
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   (c) Contingency or liability; possibility or probability.
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             Though what he learns he speaks, and may advance
             Some general maxims, or be right by chance. --Pope.
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   (d) Modesty, courtesy, or concession, or a desire to soften a
       question or remark.
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             How old may Phillis be, you ask.     --Prior.
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   (e) Desire or wish, as in prayer, imprecation, benediction,
       and the like. "May you live happily." --Dryden.
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   May be, & It may be, are used as equivalent to
      possibly, perhaps, maybe, by chance,
      peradventure. See 1st Maybe.
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The Collaborative International Dictionary of English v.0.48:

Maybe \May"be\, adv. [For it may be.]
   Perhaps; possibly; peradventure.
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         Maybe the amorous count solicits her.    --Shak.
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         In a liberal and, maybe, somewhat reckless way.
                                                  --Tylor.
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The Collaborative International Dictionary of English v.0.48:

Maybe \May"be\, a.
   Possible; probable, but not sure. [R.]
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         Then add those maybe years thou hast to live. --Driden.
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The Collaborative International Dictionary of English v.0.48:

Maybe \May"be\, n.
   Possibility; uncertainty. [R.]
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         What they offer is mere maybe and shift. --Creech.
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WordNet (r) 3.0 (2006):

maybe
    adv 1: by chance; "perhaps she will call tomorrow"; "we may
           possibly run into them at the concert"; "it may
           peradventure be thought that there never was such a time"
           [syn: possibly, perchance, perhaps, maybe,
           mayhap, peradventure]