What term is defined as an objective and definitive indicator for a specific condition?

The term defined as an objective and definitive indicator for a specific condition is "sign." Signs are observable phenomena that can be measured and verified through clinical assessment, such as swelling, bruising, or changes in range of motion. They are typically identified by a healthcare professional during an examination and are distinct from symptoms, which are subjective experiences reported by the patient.

In athletic training and other medical fields, recognizing signs is crucial for diagnosing conditions accurately and developing effective treatment plans. This medical terminology helps professionals communicate clearly about patients' conditions and the objective findings that accompany certain injuries or illnesses.

The other options relate to different concepts in the medical and athletic training fields. Diagnosis refers to the process of identifying a condition based on signs, symptoms, and other findings, while symptoms represent the subjective experiences reported by individuals. Etiology is concerned with the cause or origin of a disease or condition, not the indicators of its presence.