What do a.m. and p.m. stand for?

parallel motion

a mechanism arranged so as to impart rectilinear motion to a rod connected to a lever that moves through an arc.
Origin of parallel motion
1820-30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for parallel motion
  • The plasma continues into the nozzle where the perpendicular energy of the ions is converted into parallel motion.
  • Infinite-body conditions were approximated by constraining the edge of the region to move with parallel motion.

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