The term condition has a number of biomedical meanings including the following:

An unhealthy state, such as in "this is a progressive condition".
• A state of fitness, such as "getting into condition".
• Something which is essential to the occurrence of something else; essentially, a "precondition".
• As a verb: to cause a change in something so that a response that was previously associated with a certain stimulus becomes associated with another stimulus; to condition a person, as in behavioral conditioning.

A fixed set of conditions (including meteorological) to which the electrical performance data of a photovoltaic module are translated from the set of actual test conditions.

Conditions under which a module is typically tested in a laboratory.