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certain

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1certain/ˈsɚtn̩/adjective
1certain
/ˈsɚtn̩/
adjective
Learner's definition of CERTAIN  
not used before a noun[more certain; most certain]  : not having any doubt about something : convinced or sure
— used with it to say that something is known to be true or correct
— used to say that something will definitely happen or that someone will definitely do something — often followed by to + verb
always used before a noun  — used to refer to something or someone that is not named specifically

a certain

— used to refer to a quality that is noticed but that is difficult to explain or describe
formal  — used with the name of a person you do not know

for certain

: without a doubt : definitely or certainly

make certain

: to do something or find out something so that you have no doubt about whether something is true, correct, will happen, etc. — sometimes + of
2certain/ˈsɚtn̩/pronoun
2certain
/ˈsɚtn̩/
pronoun
Learner's definition of CERTAIN  
formal
: certain ones : particular members of a group : some — + of
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