Meaning of Mahamritunjay mantra
I worship the three eyed (the third eye is synonymous with wisdom) lord Shiva, who is full of fragrance and who nourishes everybody with health and vitality. May Shiva liberate me from mortality, just as a cucumber fallls off the creeper when it is fully ripe, may I live a full life...and know my immortal self.
Uses of Mahamrityunjai mantra
Chanting of the Mahamrityunjai mantra is recommended for a healthy body and mind. It is said to ward off untimely death by accidents or illness. Swami Sivananda of Rishikesh has recommended chanting the mantra on one's birthday for a minimum of 50,000 times. The video here helps recite the mantra correctly.
Mahamrityunjaya mantra comes from the Vedas. It is chanted to help fight physical or mental ailments. It brings peace and tranquility to the mind.