佛学大辞典

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'world', denotes the 3 spheres of existence comprising the whole universe, i.e. (1) the sensuous world (ka^ma-loka), or the world of the 5 senses; (2) the fine-material world (rúpa-loka), corresponding to the 4 fine-material absorptions (s. jha^na 1-4); (3) the immaterial world (arúpa-loka), corresponding to the 4 immaterial absorptions (s. jha^na, 5-8).
The sensuous world comprises the hells (niraya), the animal kingdom (tiraccha^na-yoni), the ghost-realm (peta-loka), the demon world (asura-nika^ya), the human world (manussa-loka) and the 6 lower celestial worlds (s. deva I). In the fine-material world (s. deva II) still exist the faculties of seeing and hearing, which, together with the other sense faculties, are temporarily suspended in the 4 absorptions. In the immaterial world (s. deva III) there is no corporeality whatsoever, only the four mental groups (s. khandha) exist there. 更多：https://www.bmcx.com/
Though the term loka is not applied in the Suttas to those 3 worlds, but only the term bhava, 'existence' (e.g. M. 43), there is no doubt that the teaching about the 3 worlds belongs to the earliest, i.e. sutta-period, of the Buddhist scriptures, as many relevant passages show.