Test

Test or testing may be one of the following processes:

Test and experiment form parts of the scientific method, to verify or falsify an expectation with an observation. See statistical hypothesis testing for the case when the outcome is subject to random variation
A Test method is a definitive procedure which produces a test result.
A Fire test, which is used to qualify fire protection products
A Test (student assessment), in education, (also called an "examination" or "exam") serves to assess or measure students' performance, knowledge or skills
In law, Legal tests are a term of art for the application of a multi-part legal standard to a question of fact or law
Quality control testing, in manufacturing, a procedure designed to test the functionality of a product under potentially harmful conditions; see also system under test
Software testing, in software engineering, identifies defects in programs
In marketing, a type of marketing research.

Other uses of the word test:

Andrew Martin used the ringname Test in professional wrestling
Test match (disambiguation), a term used in some sports to denote a contest between two international teams
Test (biology) is the shell of one of certain microbes, such as the testate foraminifera and testate amoebas
Test (Unix), a command for evaluating conditional expressions
In fishing, a measure of the strength of fishing line
River Test, England
Stiftung Warentest (Test), a German magazine

Tester

Tester' may refer to:

Somebody carrying out any of the above test processes.
A panel painting suspended above a medieval tomb, or a panel over a four poster bed used to suspend curtains.
Jon Tester, Democratic Junior Senator from Montana, USA.
A multimeter, a testing device used in electronics.