Mutual opposition; contrariety — when two things are opposed or in contradiction to each other.
彼の発言は以前の主張と相反しているため、説明が必要だ。
Because his statement contradicts his previous claim, an explanation is needed.
二つの理論は基本的に相反する立場を取っている。
The two theories fundamentally take opposing positions.
利益相反の状況では、公平な判断が難しくなる。
In situations of conflicting interests, fair judgment becomes difficult.
In genetics, repulsion (opposition) — a phenomenon where certain genes or traits are opposed or inhibit each other (technical term).
ある染色体上で相反の遺伝子が存在すると、形質が現れにくくなることがある。
When opposing genes exist on a chromosome, traits may be less likely to appear.