تعاقدوا 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.

• تعاقدوا Form 6

  6 تعاقدوا ذ They united in a contract, a compact, a covenant, an agreement, a league, a treaty, or an engagement, (S, O, K,) فِيمَا بَيْنَهُمْ [respecting the matter between them]. (S, O.) -b2- تعاقدت الكِلَابُ The dogs …

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