Principal Hindu deity worshiped as the protector and preserver of the world and restorer of dharma. He is known chiefly through his avatars, particularly Rama and Krishna. In theory, he manifests himself anytime he is needed to fight evil, and his appearances are innumerable, but in practice 10 are most common. His various names, numbering about 1,000, are repeated as acts of devotion by his worshipers.
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"What should we gain, O Krishna, husband of the goddess of fortune, and how could we be happy by killing our own kinsmen?" (Bhagavad-Gita 1.36)
According to Adi Sankara' s commentary on the Vishnu sahasranama, Madhava means the consort of Ma, or Mahalaksmi, the Mother of the universe. Alternatively, it means on who is fit to be known through Madhu-vidya or can mean One who is the Lord of "Ma" or knowledge.
Additionally, it can also mean 'one who was born in the clan of Madhu'.