The word anatomy comes from the Greek ana-meaning up or through + tome meaning a cutting. Anatomy was once a cutting up because the structure of the body was originally learned through dissecting it. The word histology came from the Greek histo- meaning tissue + logos, treatise.
Definition: Reliability is the degree to which a measurement instrument gives the same results each time that it is used, assuming that the underlying thing being measured does not change.
Reliability is the consistency or precision with which the test or assessment method measures what it claims to measure. 1  Any assessment method or test needs to be a consistent measure â this means if the test was used repeatedly on the same candidate it would produce similar results. Assessments or tests with lower reliability are of little practical use. Reliability is a very important concept and works in tandem with validity. A guiding principle for psychology is that a test can be reliable but not valid for a particular purpose, however, a test cannot be valid if it is unreliable.