/ˌæsərˈteɪn/ – Verb
Definition: 1. xác lập,xác định, xác minh, làm rõ;
2. cụ thể hóa (sự vật, hàng hóa).
A more throughout explanation: To ascertain means to find out or determine something with certainty, typically through investigation, examination, or verification.
Example: The police conducted an investigation to ascertain the identity of the suspect.