Dictionary > Observer

Observer

Definition
noun, plural: observers
(1) One (a person or a machine) that watches, monitors, takes notice, or measures
(2) (psychology) The investigator
Supplement
In scientific research, the observer may be active or passive. An active observer is one who participates directly while studying or observing a group of subjects. A passive observer is who is not participating but only watches a group of subject under study.
Related term(s):

Mentioned in:

  • Magnitude
  • Eclipse


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