Ekaggata

Ekaggatā (Pali) or Ekāgratā (, Sanskrit) means "one-pointedness", or the state (-tā) of having one (eka) point (agga or agra). This mental factor is the primary component in all jhānas and the essence of concentration samādhi. One-pointedness temporarily inhibits sensual desire, a necessary condition for any meditative attainment. Ekaggatā exercises the function of closely contemplating the object, the salient characteristic of jhāna, but it cannot perform this function alone. It requires the joint action of the other four jhāna factors each performing its own special function: vitakka, vicāra, pīti and sukha.
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