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English definition of “invisible”

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adjective [not gradable]  /ɪnˈvɪz·ə·bəl/ us  
impossible to see: Invisible bacteria can lead to food poisoning. She was so unimportant in their lives that she was almost invisible to them.
noun [U]  /ɪnˌvɪz·əˈbɪl·ɪ·t̬i/ us  
(Definition of invisible from the Cambridge Academic Content Dictionary © Cambridge University Press)
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