阿含経 (Skt, Pali; Jpn Agon-gyo )
A group of sutras containing Shakyamuni's earlier teachings, which Mahayanists later categorized as Hinayana. Agama means "teachings handed down by tradition." The Chinese Agama sutras comprise four groups, each containing a number of sutras.
The four groups, or the four Agama sutras, as they are commonly known, are the Long Agama Sutra, the Medium-Length Agama Sutra, the Miscellaneous Agama Sutra, and the Increasing by One Agama Sutra.
Theravada Buddhism bases itself on the five Agamas of the Pali canon, which are similar in composition to the four Chinese Agama sutras.
The five Agamas are Digha-nikaya (long sutras), Majjhima-nikaya (medium-length sutras), Samyutta-nikaya (sutras on related topics), Anguttara-nikaya (sutras of numerical doctrines), and Khuddaka-nikaya (minor sutras).
Nikaya means group or collection.
The first four correspond respectively to the Chinese Long Agama, Medium-Length Agama, Miscellaneous Agama, and Increasing by One Agama sutras.
See also; five Agamas; four Agama sutras.