/dɪˈkri ʌv nʌˈlɪti/ – Phrase
Definition: phán quyết của tòa án công nhận tính chất đương nhiên vô hiệu (của văn bản, việc kết hôn,..)
A more thorough explanation: A decree of nullity, in legal terms, refers to a court order declaring a marriage to be invalid or void from its inception, as if the marriage never existed. This legal action is typically sought when there are grounds to challenge the validity of a marriage, such as lack of capacity, fraud, or other legal impediments that render the marriage legally invalid.
Example: The court issued a decree of nullity, declaring the marriage between the two parties to be void ab initio.