noun
joint exercise; joint training
Used for military, emergency services, or organizational training conducted together by multiple groups.
自衛隊と米軍が共同訓練を行った。
The Self-Defense Forces and the U.S. military conducted a joint exercise.
Compound of 共同 (きょうどう, 'joint, cooperative') and 訓練 (くんれん, 'training, drill').