Combination; union; joining or merger of two or more entities (e.g., companies or organizations merging).
二つの会社は経営効率化のために合同することを発表した。
The two companies announced they would merge to improve management efficiency.
合同研修が来週開催され、両校の学生が参加する。
A joint training session will be held next week, and students from both schools will participate.
合同会社という法人形態は日本に存在する。
The legal form called a 'gōdō kaisha' (LLC) exists in Japan.
Combined; joint; shared — used as a modifier (e.g., 合同の〜) to indicate something done together by multiple parties.
合同発表では二つの研究チームが成果を報告した。
At the joint presentation, the two research teams reported their results.
合同練習で選手たちは一緒に技術を磨いた。
During joint practice, the players honed their skills together.
In mathematics, congruence: e.g., geometric congruence (figures identical in shape and size) or congruence relations (modular arithmetic).
二つの三角形が合同であることを証明せよ。
Prove that the two triangles are congruent.
a≡b (mod n) は合同式の例だ。
a≡b (mod n) is an example of a congruence (modular arithmetic).