Jisho

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ごうどう 合同
Common word JLPT N2 Links
Noun, Suru verb, Transitive verb, Intransitive verb
1. combination; union; joining; incorporation; amalgamation; merger; fusion​
Noun which may take the genitive case particle 'no'
2. combined; joint; united; shared​
Noun, Noun which may take the genitive case particle 'no'
3. congruence​Mathematics
Wikipedia definition
4. Congruence (geometry)​In geometry, two figures or objects are congruent if they have the same shape and size, or if one has the same shape and size as the mirror image of the other. More formally, two sets of points are called congruent if, and only if, one can be transformed into the other by an isometry, i.e. , a combination of translations, rotations and reflections. This means that either object can be repositioned and reflected (but not resized) so as to coincide precisely with the other object.
Read “Congruence (geometry)” on English Wikipedia
Read “合同” on Japanese Wikipedia
Read “Congruence (geometry)” on DBpedia
Jreibun
    息子が通う
  • しりつ私立
    • の小学校では、
  • けいれつ系列
    • の中学校と
  • ごうどう合同
    • で毎年運動会を
  • おこな行って
    • いる。
The private elementary school that my son attends holds an annual field day jointly with its affiliated junior high school.

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