bilateral
Bilateral negotiations, meetings, or agreements, involve only the two groups or countries that are directly concerned.
FORMAL adj ADJ n
...bilateral talks between Britain and America.
♦
bilaterally adv usu ADV after v, ADV adj
Disputes and differences between the two neighbours would be solved bilaterally.
Translation English - Cobuild Collins Dictionary  

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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"