certain

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Concise Oxford English Dictionary © 2008 Oxford University Press:
certain /ˈsəːt(ə)n, -tɪn/
adjective
  • 1 able to be firmly relied on to happen or be the case.
  • 2 completely convinced of something.
  • 3 specific but not explicitly named or stated: certain problems.

    ■ not known to the reader or hearer: a certain Mr Percy.

pronoun (certain of) some but not all.
– phrases
for certain without any doubt.
make certain take action to ensure that something happens.

■ establish whether something is definitely correct.

– origin ME: from OFr., based on L. certus ‘settled, sure’.
'certain' also found in these Oxford entries:

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