certain (EN)

adjective, determiner, pronoun

adjective “certain”

1. fully confident or sure about something; having no doubt
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   She was certain that she had locked the door before she left.
2. definite or known for sure; established beyond doubt
   The evidence makes it certain that he committed the crime.
3. moderate; not full
   We know to a certain extent how this new technology works.
4. inevitable
   If you go there, you'll face certain death.

determiner “certain”

1. specific but not named or described exactly
   She has a certain charm that is hard to define.
2. indicating a particular person who you only know by name
   A certain Mr. Smith asked me if he could make an appointment.

pronoun “certain”

1. (with 'of') some; an unspecified number of people or things from a known group
   Certain of the students were selected for the exchange program.