Definition of certain

What does the word certain mean?

• part of speech: adjective

  Settled, unfailing; unerring, reliable; sure to happen; indisputable; convinced (of, that); destined, undoubtedly going, to do; that might but need not or should not be specified (a c. person, lady of a c. age), some though perhaps not much (felt a c. reluctance), existing but probably unknown to hearer (a c. John Smith); for c., assuredly. [Latin]