any system for measuring length.
any unit used in linear measurement, as the inch, foot, meter, etc.
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Origin of linear measure
First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for linear measure
a unit or system of units for the measurement of lengthAlso called: long measure
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012