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Gurutva (Sanskrit: गुरुत्व) is one of the twenty four gunas mentioned in the joint school of Nyaya - Vaisheshika system in the Indian philosophy. The Indian philosopher Praśastapāda had mentioned the term gurutva for the cause of the act of falling, in his commentary text Praśastapādabhāṣya on the Vaisheshika Sutra of Maharshi Kanada. According to him, gurutva is the quality of the paramanus of prithvi and ap (water).