Transcensionism, or also known as the transcensionist movement, is a major belief orientation within the philosophy of Astronism holding that humanity as a whole and humans individually are presently unfulfilled in their existential purpose due to the fact that they remain both mentally and physically trapped upon the singular planet of The Earth. Transcensionist beliefs are predicated upon the notion that humanity is being starved of its true destiny by remaining settled on The Earth which also involves the deprivation of humanity's true perceptual potential.

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The belief of transcensionism is provided with the title of being The Ultimation or The Cornerstone of Millettism by Cometan in The Omnidoxy. This highlights its centrality to the cosmocentric theme of Astronism and that the beliefs within transcensionism hold integral impacts on human existentiality.