تصاون doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• تَصَاوُنٌ Form 6

  6 تَصَاوُنٌ ذ is the contr. of اِبْتِذَالٌ, (Msb,) or of تَبَذُّلٌ: (S and Msb in art. بذل:) one says, of a man, تَصَاوَنَ and , the latter on the authority of IJ, (M, TA,) and mentioned also by Z, (TA,) (assumed tropica…

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