''samādhi''

Samādhi is a noun form of the verbsamādhā (sam-ā-dhā, sum-toward/close-put, concentration/union). Similar is samāpatti (noun form of the verb sam-ā-pad, sum-toward/close-fall, completion/attainment) which is usually categorized into four formless realms (in contrast to four form meditation: form realm 色界（six sense realms: 六識感覚世界）four zen/chan/jhāna/dhyāna: 四禅): four formless realms (無色界: no six sense realms: 六識無感覚世界）four attainments 四等持（等持 seems to be derived from taking the original word as sama-āpatti, equal-attainment, stop at samãdhi/quietude: 止定/静): Fifth（第五）limitless space realm (空無辺処: 無限空間の境涯：ānanta-ākāsa āyatana） Sixth（第六）limitless consicousness realm (識無辺処: 無限意識の境涯：ānanta-viňňāna āyatana） Seventh（第七）no possession realm (無所有処: 所有意識無い境涯: ākiňcanya āyatana） Eighth（第八）neither ideas nor no ideas (非想非非想処: 観念も無観念も無い境涯：neva-saňňā naeva-asaňňā āyatana）

Ninth (第九) cessation attainment (滅尽定: complete cessation: nirodha-samāpatti: cessation of idea and feeling: 想受滅：saňňā-vedanā-nirodha āyatna) is sometimes added.