The quality or state of being valid; strength; force; especially, power to convince; justness; soundness; as, the validity of an argument or proof; the validity of an objection.

Appropriateness (also: applicability or quality) of the conclusions drawn from diagnostic values.

Refers to the reality of diagnostic categories. A diagnostic category (e.g., schizophrenia) is valid when it refers to a real clinical entity independent of diagnosis, and is an appropriate means of naming that entity.

The structural coherence of a deductive argument. An argument is valid when the premises of a syllogism are correctly related to form a conclusion. Validity does not, however, actually refer to the truthfulness of an argument?s premises. COMPARE truth.

The appropriateness, meaningfulness, and usefulness of the specific inferences made from test scores. In research, if findings are to be appropriate, meaningful and useful, they need to be valid. See also Bias; Reliability

6,7,8,9,10,11,12 A truthful or factual condition; a logical argument; the evidence that the inferences drawn from test results are accurate.

Related to the purposes of the evaluation, the degree to which inferences drawn about a student's knowledge, skills, attitudes, and behaviors from the results of assessment methods used are correct, trustworthy, and appropriate for making decisions about students.

An argument is valid if and only if there is no logically possible situation where all the premises are true and the conclusion is false.

the quality of research being used to support the argument being made.

Validity is the degree to which a certain inference from a test is appropriate or meaningful.

An argument that is correctly inferred or deduced from a premise.

Having or containing premises from which the conclusion may logically be derived, correctly inferred, or deduced.

The degree to which the inferences drawn from study results, especially generalization extending beyond the study sample, are warranted when account is taken of the study methods, the representativeness of the study sample, and the nature of the population from which it is drawn.

1.truthful or factual condition. 2. the evidence that the inferences drawn from test results are accurate.

Whether or not something is founded on truth or fact, or can be justified or defended.

The largest methodological challenge to organizational assessment, validity refers to the ability of a methodology to be relevant and meaningful as well as appropriate to an organization's mission.

Supported by objective truth or generally accepted authority

In logic, the form of an argument is valid precisely if it cannot lead from true premises to a false conclusion. An argument is said to be valid if, in every model in which all premises are true, the conclusion is true. For example: "All A are B; some A are C; therefore some B are C" is a valid form.