standard meridian[′stan·dərd mə′rid·ē·ən]
The meridian used for reckoning standard time; throughout most of the world the standard meridians are those whose longitudes are exactly divisible by 15°.
A meridian of a map projection along which the scale is as stated.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
ii. One or more meridians on a map projection, along which the scale is as stated.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved