The Anguttara Nikaya (aṅguttaranikāya; literally "Increased by One Collection," also translated "Gradual Collection" or "Numerical Discourses") is a Buddhist scripture, the fourth of the five nikayas, or collections, in the Sutta Pitaka, which is one of the "three baskets" that comprise the Pali Tipitaka of Theravada Buddhism. This nikaya consists of several thousand discourses ascribed to the Buddha and his chief disciples arranged in eleven nipatas, or books, according to the number of dhamma items referenced in them.
The Anguttara Nikaya corresponds to the Ekottara Āgama ("Increased by One Discourses") found in the Sutra Pitikas of various Sanskritic early Buddhists schools, fragments of which survive in Sanskrit. A complete version survives in Chinese translation by the name Zēngyī Ahánjīng (增一阿含經); it is thought to be from either the Mahāsāṃghika or Sarvāstivādin recensions. According to Keown, "there is considerable disparity between the Pāli and the Sarvāstivādin versions, with more than two-thirds of the sūtras found in one but not the other compilation, which suggests that much of this portion of the Sūtra Piṭaka was not formed until a fairly late date."
Translator Bhikkhu Bodhi wrote: "In Anguttara Nikaya, persons are as a rule not reduced to mere collections of aggregates, elements, and sense-bases, but are treated as real centers of living experience engaged in a heartfelt quest for happiness and freedom from suffering." (from Intro to Samyutta Nikaya)