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What are red words?

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 morefrequent, and three-star words are the most frequent.

noun [countable] American English pronunciation: slot /slɑt/ 
Word Forms
  1. 2
    a time during a series of events when it is arranged that something will happen

    We circled the airport waiting for a landing slot.

    The show has returned to its regular slot of 10:30 on Saturdays.

  2. 3
    a job that someone has as part of a team of people

    We are looking for someone to fill a senior management slot.

This is the American English definition of slot. View British English definition of slot.