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in the PONS Dictionary

I. certain [ˈsɜ:tn, Am ˈsɜ:r-] ADJ

1. certain (sure):

certain
certain
it is quite certain (that) …
to be certain about sb/sth
to make certain of sth
it is not yet certain …
to feel certain (that …)
to make certain (that …)
I don't know yet for certain
I don't know yet for certain
one thing is (for) certain …
for certain

2. certain (undeniable):

certain
certain
it is certain that …

3. certain (specified):

certain
certain
certain
a certain Steve Rukus
to a certain extent
to a certain extent

II. certain [ˈsɜ:tn, Am ˈsɜ:r-] PRON

certain