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

lateral system

a system of coding navigational aids by shape, color, and number, according to the side of a channel they occupy and their relative position along that side.
Compare cardinal system.
Origin of lateral system
1880-85 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for lateral system
  • The lateral system delivers runoff to the storm drain trunk system.
  • Lined pits shall have an underlying gravel-filled sump and lateral system or other suitable devices for the detection of leaks.

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