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  1. Oxford American Dictionary

    Hubble classification

    • IPA[ˈhəbəl ˌklasəfəˈkāSHən]
    • n.
      a simple method of describing the shapes of galaxies, using subdivisions of each of four basic types (elliptical, spiral, barred spiral, and irregular). Hubble's suggestion that they form an evolutionary sequence is no longer accepted.

    • noun: Hubble classification