- The definition of a micron is a linear measurement equal to one millionth of a meter.
An example of a micron is the unit of measure represented with the symbol "um."
nounpl. mi·crons or mi·cra also mi·krons or mi·kra
Origin of micronFrom Greek mīkron, neuter of mīkros, small.
New Latin, from Ancient Greek μικρόν (mikron), neuter of μικρός (mikros, “small”).
micron - Computer Definition
One micrometer, which is one millionth of a meter or approximately 1/25,000 of an inch. The tiny elements that make up a transistor on a chip are measured in micrometers and nanometers. See process technology.