Merriam-Webster's Collegiate Dictionary (2009) provides the following definitions of important terms when determining the credibility of information:
trans v to give a settled and often prejudiced outlook to <his background biases him against foreigners>
n a tendency to believe that some people, ideas, etc., are better than others that usually results in treating some people unfairly
n a strong interest in something or ability to do something. (p. 118)
offering reasonable grounds for being believed <a credible account of the accident> <credible witnesses>
of sufficient capability to be militarily effective <a credible deterrent> <credible forces>. (p. 293)
a thing done: such asa obsolete : feat b : crime <accessory after the fact>c archaic : action
archaic : performance, doing
the quality of being actual : actuality <a question of fact hinges on evidence>
a. something that has actual existence <space exploration is now a fact>b : an actual occurrence <prove the fact of damage>
a piece of information presented as having objective reality <These are the hard facts of the case.>. (p. 448)
adj counterfeit, sham <He was wearing a fake mustache.>
n one that is not what it purports to be: such asa : a worthless imitation passed off as genuine <The signature was a fake.>b : impostor, charlatan <He told everyone that he was a lawyer, but he was just a fake.>c : a simulated movement in a sports contest (as a pretended kick, pass, or jump or a quick movement in one direction before going in another) designed to deceive an opponent d : a device or apparatus used by a magician to achieve the illusion of magic in a trick. (p. 450)
the communication or reception of knowledge or intelligence
a (1) : knowledge obtained from investigation, study, or instruction (2) : intelligence, news (3) : facts, data b : the attribute inherent in and communicated by one of two or more alternative sequences or arrangements of something (as nucleotides in DNA or binary digits in a computer program) that produce specific effects c (1) : a signal or character (as in a communication system or computer) representing data (2) : something (as a message, experimental data, or a picture) which justifies change in a construct (as a plan or theory) that represents physical or mental experience or another construct d : a quantitative measure of the content of information; specifically : a numerical quantity that measures the uncertainty in the outcome of an experiment to be performed
the act of informing against a person
a formal accusation of a crime made by a prosecuting officer as distinguished from an indictment presented by a grand jury. (p. 641)
a literary work holding up human vices and follies to ridicule or scorn
trenchant wit, irony, or sarcasm used to expose and discredit vice or folly. (p. 1104)