/ɪˈfɛktɪv deɪt ʌv ˌtɜrmɪˈneɪʃən/ – Phrase
Definition: Ngày hiệu lực chấm dứt.
A more thorough explanation: the date that an employment contract ends
Example: Executive will be entitled to any unpaid Base Salary accrued up to the effective date of termination.