Which term signifies a characteristic limit in an experiment?

The term that signifies a characteristic limit in an experiment is "parameter." In scientific experimentation, parameters refer to the specific conditions, limits, or values that define the boundaries of the experiment. These parameters are crucial as they help to establish the framework within which the experiment is conducted, ensuring that it remains controlled and that results are valid and reliable. For example, in a biology experiment, parameters might include temperature, pH level, and concentration of solutions, each influencing the outcome of the experiment.

The other terms do not relate directly to the concept of limits in an experimental context. "Occluded" refers to something that is blocked or obscured, typically in a spatial context, and does not imply a limit in experimentation. "Ominous" carries a connotation of foreboding or indicating something unfortunate, which is not relevant to experimental limits. "Overt" means something that is open and observable, again not linked to the idea of a specific limit within an experiment. Therefore, "parameter" is the most accurate choice when discussing an aspect that defines the scope or limits of an experimental framework.