/ɪˌlɛdʒəˈlɪti ʌv ðə ˈsʌbdʒɪkt ˈmætər/ – Phrase
Definition: Vi phạm về vấn đề chủ thể.
A more thorough explanation: principle that the courts will not enforce contracts that involve unlawful things or acts, eg drugs, prostitution, extortion, etc.
Example: A valid contract depends on the legality or illegality of the subject matter.