1. n. an initial assessment designed to measure existing characteristics (e.g., knowledge, ability) before some intervention, condition, manipulation, or treatment is introduced. Pretests often are given to research participants before they take part in a study. For example, in a study examining whether training helps math performance, participants might be administered a short math test to assess their original knowledge prior to undergoing the training. See also posttest.

2. n. a test administered before the main study to ensure that participants understand the instructions and procedures. See pilot study; practice trial.

3. vb. to administer a pretest.