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in the PONS Dictionary

I. certain [ˈsɜ:tən, Am ˈsɜ:rt-] ADJ

1. certain (sure):

certain
pewny
certain fact
niezbity
certain cure
niezawodny
certain about [or of] sth
pewny czegoś
for certain
na pewno
to make certain that...
upewnić się, że...
he's certain to agree
on na pewno się zgodzi

2. certain (some):

certain
pewien
with a certain impatience
z pewną niecierpliwością

3. certain (not known):

certain
niejaki
a certain Mr Joyce
niejaki pan Joyce

II. certain [ˈsɜ:tən, Am ˈsɜ:rt-] PRON

certain of them
niektórzy z nich