An operational definition specifies exactly how a concept will be measured, observed or manipulated within a particular study. It links abstract ideas to concrete procedures such as test scores, frequencies or observable behaviours. This makes the concept empirically accessible and allows other researchers to replicate the work. Hence, a definition based on measurement procedures is correctly termed an operational definition.
Option A:
A conceptual definition explains the meaning of a concept at an abstract or theoretical level, often using other ideas or terms, but it does not spell out the specific empirical procedures to be used. While necessary for theory, it does not meet the requirement stated in the stem.
Option B:
A theoretical definition situates the concept within a broader framework or model, clarifying its relations to other constructs, but it again remains at a conceptual level. It does not describe the precise steps for observing or measuring the construct in a concrete study. Therefore, theoretical definition is not the best completion.
Option C:
A dictionary definition gives a general, everyday meaning of a term for common usage, which may not be sufficiently precise or tailored for research purposes. It does not necessarily specify operational procedures for measurement. Thus, dictionary definition is not appropriate for the kind of definition mentioned in the question.
Option D:
Operational definitions translate theoretical concepts into observable indicators, such as defining βachievementβ as scores on a particular standardised test. This direct tie to procedures allows systematic testing of hypotheses, which matches exactly what the stem describes.
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