relative motion

noun

Definition of relative motion

  1. 1 :  motion as observed from or referred to some material system constituting a frame of reference (as two adjacent walls and floor of a room) — see relativity 3

  2. 2 :  the motion of one body with respect to another regarded as fixed — compare relative velocity

Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Seen and Heard

What made you want to look up relative motion? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to criticize severely

Get Word of the Day daily email!