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Comprehensive
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radar the use of radio waves to track the location, distance, and speed of faraway objects. Waves are sent out and then picked up again when they bounce back after hitting some object. [1/2 definitions]
second sight the alleged ability to witness faraway events and foresee the future; clairvoyance.
telemeter an instrument for determining the distances to faraway objects by means of measuring angles. [1/3 definitions]