Certain = specific / sure (adjectives that change meaning according to position)

Note that certain adjectives change their meanings depending if they appear before or after the noun.

Look at these uses of certain/certaine:

Un certain hommea particular man

C'est une opportunité certaine.It's a sure opportunity.

Une femme d'un certain âge.A woman of a certain age.

Certains projets sont faciles.Certain projects are easy.

Before the noun, certain/certaine means some or particular: it retains a vagueness here.

After the noun, the meaning of certain is similar to the English one of being sure, certain, unquestionable

Note: generally adjectives appear after the noun, but some very common adjectives go before.

 See also: 

Ancien = former / old (adjectives that change meaning according to position) 

Cher= dear / expensive (adjectives that change meaning according to position) 

Propre = own / clean (adjectives that change meaning according to position) 

Dernier = final / previous (adjectives that change meaning according to position)

Vrai = real / true (adjectives that change meaning according to position)  

 

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Examples and resources

C'est une opportunité certaine.It's a sure opportunity.
Un homme certain.A reliable man.
Un certain hommea particular man
Une femme d'un certain âge.A woman of a certain age.
Certains projets sont faciles.Certain projects are easy.
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