1. [n]  something or someone that provides pleasure; a source of happiness; "a joy to behold"; "the pleasure of his company"; "the new car is a delight"
2. [n]  the emotion of great happiness
3. [v]  make glad or happy
4. [v]  feel happiness or joy

Joy
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1. \Joy\, n. [OE. joye, OF. joye, joie, goie, F. joie, L.
   gaudia, pl. of gaudium joy, fr. gaudere to rejoice, to be
   glad; cf. Gr. ? to rejoice, ? proud. Cf. {Gaud}, {Jewel}.]
   1. The passion or emotion excited by the acquisition or
      expectation of good; pleasurable feelings or emotions
      caused by success, good fortune, and the like, or by a
      rational prospect of possessing what we love or desire;
      gladness; exhilaration of spirits; delight.
            Her heavenly form beheld, all wished her joy.
                                                  --Dryden.
            Glides the smooth current of domestic joy.
                                                  --Johnson.
            Who, for the joy that was set before him, endured
            the cross, despising the shame.       --Heb. xii. 2.
            Tears of true joy for his return.     --Shak.
            Joy is a delight of the mind, from the consideration
            of the present or assured approaching possession of
            a good.                               --Locke.
   2. That which causes joy or happiness.
            For ye are our glory and joy.         --1 Thess. ii.
                                                  20.
            A thing of beauty is a joy forever.   --Keats.
   3. The sign or exhibition of joy; gayety; mirth; merriment;
      festivity.
            Such joy made Una, when her knight she found.
                                                  --Spenser.
            The roofs with joy resound.           --Dryden.
   Note: Joy is used in composition, esp. with participles, to
         from many self-explaining compounds; as, joy-hells,
         joy-ringing, joy-inspiring, joy-resounding, etc.
   Syn: Gladness; pleasure; delight; happiness; exultation;
        transport; felicity; ecstasy; rapture; bliss; gayety;
        mirth; merriment; festivity; hilarity.
   

2. \Joy\, v. i. [imp. & p. p. {Joyed}; p. pr. & vb. n.
   {Joying}.] [OF. joir, F. jouir. See {Joy}, n.]
   To rejoice; to be glad; to delight; to exult.
         I will joy in the God of my salvation.   --Hab. iii.
                                                  18.
         In whose sight all things joy.           --Milton.
   

3. \Joy\, v. t.
   1. To give joy to; to congratulate. [Obs.] ``Joy us of our
      conquest.'' --Dryden.
            To joy the friend, or grapple with the foe. --Prior.
   2. To gladden; to make joyful; to exhilarate. [Obs.]
            Neither pleasure's art can joy my spirits. --Shak.
   3. To enjoy. [Obs.] See {Enjoy}.
            Who might have lived and joyed immortal bliss.
                                                  --Milton.
   

A functional programming language by Manfred von Thun. Joy is unusual because it is not based on lambda calculus, but on the composition of functions. Functions take a stack as argument, consume any number of parameters from it, and return it with any number of results on it. The concatenation of programs denotes the composition of functions. One of the datatypes of Joy is that of quoted programs, of which lists are a special case.

Joy Home.