External validity refers to the degree to which findings can be generalized or extended to people, settings, times, measures, and characteristics other than the ones in the original study.
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external validity refers to the extent to which research findings generalize, or apply, to people and settings not involved in the study.
Other /More definition:
External validity is defined as a standard for evaluating research. Research has high external validity if the findings can be generalized to other participants in other situations. It is the extent to which a study's results can be generalized to phenomena in real life

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