invisible Definition in Cambridge British English Dictionary
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Definition of "invisible" - British English Dictionary

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invisibleadjective

uk   us   /ɪnˈvɪz.ɪ.bl̩/
B2 impossible to see: The aircraft is designed to be invisible to radar. These bacteria are invisible unless viewed with a microscope. [before noun] specialized finance & economics used to refer to money that is added to a country's economy by activities such as the service and financial industries rather than the production of goods in factories: an increase in invisible exports Tourism brings in 40 percent of the island's invisible earnings.
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invisibly
adverb uk   us   /-bli/
invisibility
noun [U] uk   /ɪnˌvɪz.əˈbɪl.ɪ.ti/  us   /-ə.t̬i/
The bits of gold in the sand were small to the point of invisibility (= so small that they almost could not be seen).
(Definition of invisible from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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