certain

Entry Definition
s/he is a certain one, particular one, special one
it is a certain one, is a particular one, is special one
s/he inquires; s/he makes certain
s/he reaches certain age; s/he comes of age
it is known thoroughly or perfectly; it is known with certainty, is known to be true
s/he knows it thoroughly or perfectly; s/he knows it for certain, knows it to be true
s/he is reliable, can be counted or depended on, is certain to fulfil responsibility or obligation
it is certain, sure; it is assumed to be true
s/he is convinced of it, certain of it; s/he assumes it to be true
s/he is certain about it