Quotes:Plane
H. P. Blavatsky
Plane. From the Latin planus (level, flat) an extension of space or of something in it, whether physical or metaphysical, e.g., a “plane of consciousness”. As used in Occultism, the term denotes the range or extent of some state of consciousness, or of the perceptive power of a particular set of senses, or the action of a particular force, or the state of matter corresponding to any of the above.
Source: H. P. Blavatsky, The Theosophical Glossary, art. Plane