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English definition of “certain”


adjective (PARTICULAR)   /ˈsɜr·tən/
particular but not named or described: Parents expect their kids to leave home at a certain point. certain    /ˈsɜrt·ən/ pronoun Charges were filed against certain of the company’s directors.
(Definition of certain adjective (PARTICULAR) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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to direct the way that a ship, aircraft, etc. will travel, or to find a direction across, along, or over an area of water or land, often by using a map

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