To apply a means test to an individual or group.

The correlation of longevity with validity of an idea or trend.

A Rorschach test

(medicine) A test used to assess the ability of a person's blood to clot, carried out by cutting the skin and measuring the time it takes for the resulting bleeding to stop.

(chemistry) The addition of a single drop of a reagent to a small sample as a qualitative analytical test for the presence of a specific compound or class of compounds.

(statistics) A statistical test for deciding whether a data point is an outlier.

To test something using the conditions that it was designed to operate under, especially out in the real world instead of in a laboratory or workshop.

The state or quality of being testy.

In a testy way; in the manner of someone who is testy.

To fly an aircraft in order to evaluate its performance