Mahamrityunjaya Mantra (maha-mrityun-jaya) is one of the more potent of the ancient Sanskrit mantras. Maha mrityunjaya is a call for enlightenment and is a practice of purifying the karmas of the soul at a deep level. It is also said to be quite beneficial for mental, emotional, and physical health.

We Meditate on the Three-eyed reality
Which permeates and nourishes all like a fragrance.
May we be liberated from death for the sake of immortality,
Even as the cucumber is severed from bondage to the creeper.

Tryambakam: Trya means three. Ambakam means eyes. It means the three eyes of the Absolute, which are the processes of creation, existence, and dissolution, as well as the other triads, which are part of AUM. The three "eyes" means experiencing these three stages and triads at one time, from the higher, all pervasive vantage point of the Absolute.

The Maha Mrityunjaya Mantra is a prayer to Lord Shiva (part of the hindu trinity, the lord of destruction, penance and meditation) for help in overcoming "death". The seeker is more concerned with avoiding spiritual "death" rather than physical "death". The mantra is a request to Lord Shiva to lead us to the mountain of meditation, which is indeed Lord Shiva's abode.