Rationalsphere

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    An online community of individuals, centered around the forum LessWrong and the blog Slate Star Codex, who discuss philosophy, psychology, and futurism through the lens of Bayesianism and rationality. no-plural

    "Several of the key concepts that do the rounds in the Rationalsphere these days first arose on SL4 and the Extropians."

Example

More examples

"Several of the key concepts that do the rounds in the Rationalsphere these days first arose on SL4 and the Extropians."

Etymology

rational + or rationalist + -sphere (“designating a particular realm or interest of a group of people, object, etc”)

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.