1. occurring before or existing prior to an experiment; relating to the stage or period before an experiment is conducted
Usage: technical; academic

Examples

• The researchers collected preexperimental data to establish a baseline for comparison.
• Preexperimental observations helped the team identify potential variables to control.
• The study included a preexperimental phase lasting two weeks before the main trial began.
• Preexperimental testing revealed that the equipment needed calibration.
• The preexperimental design allowed scientists to refine their hypotheses before full implementation.