The term is a combination of chiram, or 'permanent', and jīvi, or 'lived'. It is similar to amaratva, which refers to true immortality. At the end of the last Manvantara, a demon attempted to become immortal by swallowing the sacred pages of Vedas, as they escaped from the mouth of Brahma. The scripture was retrieved by the first avatar of Lord Vishnu. Incarnations of Vishnu also later fought and killed two other asuras, Hiranyakasipu and Ravana, who tried to become immortal through obeisance to Lord Brahma and Lord Shiva, respectively. In one sense immortal can mean "to live eternally until the destruction of Universes," i.e.; all physical bodies are foretold to become immaterial at the end of time, along with the Brahma himself, with the destruction of the Universe.
Attributes
The extant Puranas, the Ramayana, and the Mahabharata describe seven long-lived personalities in the Hindu pantheon. There are others as well, which are not included in the one particular shloka. Each represents a different attribute of man, which as long as they live, will exist amongst humanity. "Ashwatthama Balir Vyaso Hanumanash cha Vibhishana Krupacharya cha Parashuramam Saptaita Chiranjeevanam" - 'Ashwathama, King Mahabali, Vyasa, Hanuman, Vibhishana, Kripacharya and Parashurama are the seven death-defying or imperishable personalities'. The Chiranjivis are as follows:
Vyasa, the sage who composed the Mahabharata. He represents erudition and wisdom. He was the son of sage Parashara and great-grandson of sage Vashishtha. He was born towards the end of Treta Yuga, lived to see the complete Dvapara Yuga, and also saw the initial phase of Kali Yuga.
Hanuman, served Rama. One of the greatest brahmachari. He stands for selflessness, courage, devotion, intelligence, strength, celibacy and righteous conduct.
Parashurama, 6th avatar of Vishnu, knowledgeable about all astras, sastras and divine weapons. The Kalki Purana writes that he will re-emerge at the end of time to be the martial guru of Kalki. He will then instruct the final avatar to undertake penance to receive celestial weaponry, required to save mankind at the end time.
Vibhishana, brother of Ravana. Vibhishana surrendered to Rama before his battle with Ravana. Later, he was crowned king ofLanka after Ravana was killed by Rama. He stands for righteousness. Vibhishana is not a true Chiranjivi, as his boon of longevity is to remain on the earth only until the end of the Maha Yuga.
Ashwatthama, the son of Drona, a great warrior. Drona did many years of severe penance to please lord Shiva in order to obtain a son who possessed the same valiance as Lord Shiva. Ashwatthama is the avatar of one of the eleven Rudras. Ashwatthama and Kripa are believed to be the lone survivors still living who actually fought in the Kurukshetra War. He might be immortal but Krishna gave him a curse that, he would live forever but can neither communicate with anyone nor touch anything, with his body covered with painful sores and ulcers that would never cure.
Mahabali, also called Maha Bali, was the virtuous emperor of the three worlds and Son of Virochana and grandson of Prahlada who were of Asura descent. During the Vamana avatar, Lord Vishnu blessed him to be a Chiranjivi. Every year on the day of Onam, he descends to earth from the heavens to visit his people, those of the region of Kerala.
Kripa, royal guru of the princes in the Mahabharata.
Hindu scripture contains a mantra about the seven immortals, in which their names are recited for luck and longevity: अश्वत्थामाबलिर्व्यासोहनुमांश्च विभीषण:कृपश्चपरशुरामश्च सप्तैतेचिरंजीविन:। Apart from the seven Chiranjivis above mentioned, there exist other Chiranjivis as well. For instance, Sage Markandeya, who at the age of sixteen was blessed with immortality. अश्वत्थामा बलिव्र्यासो हनूमांश्च विभीषण:। कृप: परशुरामश्च सप्तएतै चिरजीविन:॥ सप्तैतान् संस्मरेन्नित्यं मार्कण्डेयमथाष्टमम्। जीवेद्वर्षशतं सोपि सर्वव्याधिविवर्जित॥ इस श्लोक का अर्थ यह है कि इन आठ लोगों का स्मरण सुबह-सुबह करने से सारी बीमारियां समाप्त होती हैं और मनुष्य 100 वर्ष की आयु को प्राप्त करता है। The above lines mean that by daily remembering these 8 immortals one can be free of all Ailments and live for more than 100 years.These are also referred to as the 8 great warriors.