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90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.



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verb [transitive] formal invalidate pronunciation in British English /ɪnˈvælɪdeɪt/
Word Forms
present tense
present participleinvalidating
past tenseinvalidated
past participleinvalidated
  1. 1
    to make something such as a document, contract, or process no longer legally effective
    Failure to report any changes in your situation may invalidate your insurance policy.
  2. 2
    to prove that an argument or opinion is wrong
    This study invalidates their earlier research.


used to describe foods which don't contain ingredients such as wheat, dairy products etc …

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Open Dictionary

red market

the buying and selling of human organs

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