The Collaborative International Dictionary of English v.0.48:

Ought \Ought\ ([add]t), n. & adv.
   See Aught.
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The Collaborative International Dictionary of English v.0.48:

Ought \Ought\, imp., p. p., or auxiliary. [Orig. the preterit of
   the verb to owe. OE. oughte, aughte, ahte, AS. [=a]hte.
   [root]110. See Owe.]
   1. Was or were under obligation to pay; owed. [Obs.]
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            This due obedience which they ought to the king.
                                                  --Tyndale.
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            The love and duty I long have ought you. --Spelman.
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            [He] said . . . you ought him a thousand pound.
                                                  --Shak.
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   2. Owned; possessed. [Obs.]
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            The knight the which that castle ought. --Spenser.
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   3. To be bound in duty or by moral obligation.
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            We then that are strong ought to bear the
            infirmities of the weak.              --Rom. xv. 1.
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   4. To be necessary, fit, becoming, or expedient; to behoove;
      -- in this sense formerly sometimes used impersonally or
      without a subject expressed. "Well ought us work."
      --Chaucer.
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            To speak of this as it ought, would ask a volume.
                                                  --Milton.
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            Ought not Christ to have suffered these things?
                                                  --Luke xxiv.
                                                  26.
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   Note: Ought is now chiefly employed as an auxiliary verb,
         expressing fitness, expediency, propriety, moral
         obligation, or the like, in the action or state
         indicated by the principal verb.
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   Syn: Ought, Should.

   Usage: Both words imply obligation, but ought is the
          stronger. Should may imply merely an obligation of
          propriety, expendiency, etc.; ought denotes an
          obligation of duty.
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The Collaborative International Dictionary of English v.0.48:

Owe \Owe\ ([=o]), v. t. [imp. & p. p. Owed ([=o]d), (Ought
   ([add]t) obs.); p. pr. & vb. n. Owing ([=o]"[i^]ng).] [OE.
   owen, awen, aghen, to have, own, have (to do), hence, owe,
   AS. [=a]gan to have; akin to G. eigen, a., own, Icel. eiga to
   have, Dan. eie, Sw. [aum]ga, Goth. ['a]igan, Skr. [imac][,c].
   [root]110. Cf. Ought, v., 2d Own, Fraught.]
   1. To possess; to have, as the rightful owner; to own. [Obs.]
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            Thou dost here usurp
            The name thou ow'st not.              --Shak.
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   2. To have or possess, as something derived or bestowed; to
      be obliged to ascribe (something to some source); to be
      indebted or obliged for; as, he owed his wealth to his
      father; he owed his victory to his lieutenants. --Milton.
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            O deem thy fall not owed to man's decree. --Pope.
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   3. Hence: To have or be under an obigation to restore, pay,
      or render (something) in return or compensation for
      something received; to be indebted in the sum of; as, the
      subject owes allegiance; the fortunate owe assistance to
      the unfortunate.
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            The one ought five hundred pence, and the other
            fifty.                                --Bible
                                                  (1551).
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            A son owes help and honor to his father. --Holyday.
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   Note: Owe was sometimes followed by an objective clause
         introduced by the infinitive. "Ye owen to incline and
         bow your heart." --Chaucer.
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   4. To have an obligation to (some one) on account of
      something done or received; to be indebted to; as, to owe
      the grocer for supplies, or a laborer for services.
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The Collaborative International Dictionary of English v.0.48:

Aught \Aught\, n. [OE. aught, ought, awiht, AS. [=a]wiht, [=a]
   ever + wiht. [root]136. See Aye ever, and Whit, Wight.]
   Anything; any part. [Also written ought.]
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         There failed not aught of any good thing which the Lord
         has spoken.                              --Josh. xxi.
                                                  45
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         But go, my son, and see if aught be wanting. --Addison.
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