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What is another word for light barrier?

Need synonyms for light barrier? Here's a list of similar words from our thesaurus that you can use instead.

Noun
The speed of light viewed as an uncrossable barrier to acceleration from subluminal and superluminal speeds in special relativity
“The installation of the light barrier and pushbutton panels is to be assessed according to the operator work station and the type, size and shape of the positioner.”
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