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in the PONS Dictionary

I. cer·tain [ˈsɜ:tən, Am ˈsɜ:rt-] ADJ

1. certain:

certain (sure)
certain (unavoidable)
certain (unavoidable)
one thing is certain
that was certain to happen
it is not yet certain
to face certain death
for certain
I don't know yet for certain
one thing is for certain
I can't say for certain
to mean certain death
to feel certain [that ...]
to make certain [that ...] (ensure)
to make certain [that ...] (check)
to make certain of sth
to seem certain [that ...]
to seem certain [that ...]
to be certain about [or of] sth
sich dat einer S. gen sicher sein
are you certain about that?
to be certain [that] sb does sth
I wouldn't be too certain that ...
to be certain [that] sth will happen
to be certain to do sth (intend)
to be certain to do sth (check) be certain to lock the door

2. certain attr, inv (limited):

certain
to a certain extent
up to a certain point

3. certain attr, inv:

certain (specified)
certain (unspecified also)
at a certain age
a certain Steve Rukus

4. certain attr, inv (particular):

certain
certain

II. cer·tain [ˈsɜ:tən, Am ˈsɜ:rt-] PRON pl

cer·tain an·ˈnu·ity N ECON, FIN

certain annuity
OpenDict entry

to excel in certain areas VB

to excel in certain areas