Class M

adjective

Of a planet: having characteristics similar to that of Earth.

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Meanings

Class M1

adjectiveClass M (not comparable)

alternative class M

  1. not comparableliteratureOf a planet: having characteristics similar to that of Earth.

class M2

adjectiveclass M (not comparable)
  1. not comparableAlternative letter-case form of Class M.

Origin

Originally from the TV series Star Trek.

Full word history & related roots →
Cite this entry
APA

Class M. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/Class%20M

MLA

“Class M.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Class%20M. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “Class M,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/Class%20M.

Source: Class M on Wiktionary, CC BY-SA 4.0.