assured in mind; convinced
established beyond doubt or question
It is certain that the problem exists
fixed, settled
said of judgment, etc: unerring; dependable
inevitable
the certain advance of age and decay
incapable of failing; destined
She is certain to do well
of a known but unspecified character, quantity, or degree
a house with a certain charm
named but not known
a certain Mr Brown
moderate
to a certain extent
for certain
without doubt; assuredly
[Middle English via Old Frenchfrom Latin certus, past part. of cernere to sift, discern, decide]