This is the 1225th most frequent Russian word.
международном
"Международном" means "international" in English.
Here, 'международном' is an adjective describing the noun 'форуме', denoting the international scope of the event.
Мы обсуждали экономику на международном форуме.
We discussed the economy at the international forum.
In this sentence, 'международном' is used to qualify 'конкурсе', implying that the competition involves participants from various countries.
Он участвует в международном конкурсе.
He is participating in an international competition.
Here, 'международном' attributes the characteristic of being between nations to the noun 'договоре'.