from The Century Dictionary.
- noun A line, on a chart, showing the occurrence of equal quantities, conditions, or frequencies of any phenomenon in its relation to two independent coordinates. This term was first used by Vogler (1880), but the lines themselves had long been familiar.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
linedrawn on a mapthrough all pointshaving the same valueof some measurable quantity.
- noun thermodynamics A line in a phase diagram indicating the same mole fraction.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a line drawn on a map connecting points having the same numerical value of some variable
from Wiktionary, Creative Commons Attribution/Share-Alike License
From iso- + Ancient Greek πλῆθος (plēthos, "a great number").
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