The degree to which something conforms to requirements or is compatible with something else; fitness or adaptability.
このソフトウェアは古いOSとの適合性が低く、動作しない場合がある。
This software has low compatibility with older operating systems and may not run.
製品の適合性を確認するために、複数のテストを実施した。
We performed several tests to verify the product's conformity/compatibility.
設計段階で適合性を考慮しないと、後で問題が発生しやすい。
If compatibility isn't considered during the design phase, problems are likely to arise later.