Etymology

proper motion

Today it means: The change in apparent position of a celestial body due to that body's velocity relative to the Sun. Full definition →

Latin proprius
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The story

  1. Latin · derived fromproprius
  2. English todayproper motion

proper (in the sense of "its own") + motion; from Latin proprius.

Words from the same roots

Latinproprius all →

properpresbypropriaproper leftproper rightpropriospinal

Etymology from Wiktionary, CC BY-SA 4.0.