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/ænˈtʌm.bɹə/ · noun
(rare) The region from which an occulting body appears entirely contained within the disc of the light source..
Use antumbra when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Antumbra means (rare) The region from which an occulting body appears entirely contained within the disc of the light source..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use antumbra where its definition matches the intended context.
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