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  1. Dictionary
    penumbra
    /pɪˈnʌmbrə/

    noun

    • 1. the partially shaded outer region of the shadow cast by an opaque object.
    • 2. a peripheral or indeterminate area or group: "an immense penumbra of theory surrounds any observation"

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  2. www.merriam-webster.com › dictionary › penumbraPenumbra Definition & Meaning - Merriam-Webster

    Penumbra is a noun that means a space of partial illumination, a shaded region, or a body of rights implied in a constitution. Learn more about its etymology, synonyms, examples, and related words.

  3. dictionary.cambridge.org › dictionary › englishPENUMBRA | English meaning - Cambridge Dictionary

    Penumbra is a part of a shadow in which only some of the light is blocked, used especially about a shadow made during an eclipse. Learn how to use this word in different contexts, see related words and phrases, and find translations in various languages.

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  5. dictionary.cambridge.org › us › dictionaryPENUMBRA | definition in the Cambridge English Dictionary

    Penumbra is a part of a shadow where some light is blocked, especially in an eclipse. Learn how to use this word in sentences and find translations in different languages.

  6. www.vocabulary.com › dictionary › penumbraPenumbra - Definition, Meaning & Synonyms | Vocabulary.com

    In a lunar eclipse, the edge of the earth's shadow — the part that isn't fully dark — is its penumbra. Sun spots also have a penumbra, the outer edge that's not quite as dark as the center. The word comes from the Latin root umbra, which means "shadow." The pen part means "almost," so a penumbra is "almost shadow."

  7. www.dictionary.com › browse › penumbraPENUMBRA Definition & Meaning | Dictionary.com

    Penumbra is a partial or imperfect shadow, especially in astronomy or law. Learn the origin, usage, and examples of penumbra and its contrast with umbra.

  8. www.thefreedictionary.com › penumbraPenumbra - definition of penumbra by The Free Dictionary

    Penumbra is a partial shadow or a diffuse outer part of something, such as an eclipse, a sunspot, or a painting. Learn more about its origin, usage, and synonyms from various dictionaries and sources.

  9. www.oxfordlearnersdictionaries.com › english › penumbrapenumbra noun - Definition, pictures, pronunciation and usage...

    Penumbra is an area of shadow that is between fully dark and fully light, or the shadow made by the earth or the moon during a partial eclipse. Learn more about this word, its origin, and how to use it in sentences with Oxford Advanced Learner's Dictionary.