The Collaborative International Dictionary of English v.0.48:

Commerce \Com*merce"\ (? or ?), v. i. [imp. & p. p. Commerced;
   p. pr. & vb. n. Commercing.] [Cf. F. commercer, fr. LL.
   commerciare.]
   1. To carry on trade; to traffic. [Obs.]
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            Beware you commerce not with bankrupts. --B. Jonson.
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   2. To hold intercourse; to commune. --Milton.
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            Commercing with himself.              --Tennyson.
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            Musicians . . . taught the people in angelic
            harmonies to commerce with heaven.    --Prof.
                                                  Wilson.
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