What does level mean?

“A LEVEL surface is one that is everywhere orthogonal to a plumb line – meaning that any tangent to the surface forms a 90 degree angle with a plumb line at that point.”

-George Hnatiuk

Also see the collection of definitions of level by Jesse Kozlowski, a licensed geodetic surveyor: https://jessekozlowski.wordpress.com/2020/02/19/definition-of-level/

From “The Theory and Practice of Surveying; Containing All the Instructions requisite for the skillful practice of this Art.”, published 1814

Level Figure from Theory Practive of Surveying.png

This dictionary:

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Has this definition:

95264021_10158336528855030_5208140771206627328_n.jpgLEVEL SURFACE 2

HORIZONTAL PLUMBLINE NOT PARALLEL GLOSSARY OF MAPPING. CHARTING. AND GEODETIC TERMS

LEVEL DURR

LEVEL SURFACEIMG_0645IMG_0704LEVEL A treatise on surveying and navigationLEVEL A treatise on surveying, containing the theory and practiceLEVEL AND HORIZONTAL TEXTBOOK OF SURVEYING 2LEVEL COMPLETE DICTIONARY OF ARTS AND SCIENCES 1768 2LEVEL COMPLETE DICTIONARY OF ARTS AND SCIENCES 1768 3LEVEL COMPLETE DICTIONARY OF ARTS AND SCIENCES 1768LEVEL DEFINITION 2 DEFINITIONS OF TERMS USED IN GEODETIC AND OTHER SURVEYSLEVEL DIAGRAMLevel EquationLEVEL FRESNO STATE 2LEVEL FRESNO STATELEVEL GLOSSARY OF MAPPING. CHARTING. AND GEODETIC TERMS 1973LEVEL GLOSSARY OF MAPPING. CHARTING. AND GEODETIC TERMSLEVEL LAND SURVEYOR REFERENT GUIDELEVEL LEVELING TERMSLEVEL LEVELLING ITS GENERAL APPLICATION 1887LEVEL ORIG TEXTBOOK OF SURVEYINGLEVEL REFERENCE MANUAL SURVEYINGLEVEL REFERENCE MANUALLEVEL Science and Industry, Volume 3, 1898 2LEVEL Science and Industry, Volume 3, 1898LEVEL SUKN 2LEVEL SUKNLEVEL SURVEY DEFINITIONS USDALEVEL SURVEYING DEFINITIONS CURVED SEA LEVELLEVEL TEXTBOOK OF SURVEYING HORIZONTAL 2LEVEL THE CONSTRUCTOR SITELEVEL The Principles and Practice of Surveying 1908LEVEL The Theory and Practice of Surveying 1812 2LEVEL The Theory and Practice of Surveying 1812 3LEVEL The Theory and Practice of Surveying 1812LEVELING AND CONTOURING - CopyLEVELING AND CONTOURINGLOLOLOLPLUMB LINES NOT PARALLEL SURVEY CURVATUREPLUMB LINES NOT PARALLEL THE THEORY AND PRACTICE OF SURVERYINGPLUMB LINES NOT PARALLEL THE THEORY AND PRACTICE OF SURVERYING COVERPLUMB LINES NOT PARALLEL WYOMING DOT SURVEY MANUALSPHERICAL EXCESS A TREATISE ON LAND SURVEYING AND LEVELLINGSPHERICAL EXCESS GLOSSARY OF MAPPING. CHARTING. AND GEODETIC TERMSSPHERICAL EXCESS Surveying, as Practiced by Civil Engineers and SurveyorsSPHERICAL EXCESS TEXTBOOK OF SURVEYING 2SPHERICAL EXCESS TEXTBOOK OF SURVEYING 3SPHERICAL EXCESS TEXTBOOK OF SURVEYING