What is the ruling on saying "Ameen" and what is the correct way to pronounce it in terms of prolongation (madd)?

It is legislated to say "Ameen" after Al-Fatihah, or the supplication of the Khatib (preacher), or the Qunut. Its meaning is "O Allah, answer [our supplication]." Allah the Almighty said to Moses and Aaron: (Your supplication has been answered), and Moses supplicated while Aaron said "Ameen."

The utterance of "Ameen" is a supplication connected to another. It is said in prayer after Al-Fatihah, and in the Qunut of Fajr, Witr, and Nazilah (calamity). Outside of prayer, it is said after Al-Fatihah, and in the Friday sermon and the prayer for rain (Istisqa').

For "Ameen," there are two well-known linguistic forms: lengthening (madd) and shortening (qasr), both with a light meem. The most eloquent of them is with lengthening and a light meem.

It is reported from the Prophet, peace be upon him, that he would lengthen his voice with "Ameen" after reciting (not of those against whom is Your wrath, nor of those who are astray).

It is permissible to lengthen the alif and yaa for two counts (natural madd), or two, four, or six counts (madd badal and madd arid lil-sukoon). The matter in this regard is broad. It is important to match the imam in saying "Ameen" in prayer.