Magnetic Deflection: Method of bending electrons in a CRT by means of the magnetic field produced by coils placed outside the tube.

Management Review: Formal evaluation by top management of the status and adequacy of the quality system in relation to quality policy and objectives.

Mass: Measure of the quantity of matter that a body contains.

Mass Density: Mass per unit volume.

Mass Number: (The number of protons and neutrons in the atomic nucleus of an element.

Mass Unit: A unit of measurement for mass.

Mcleod Gage: A primary instrument for the measurement of pressure in a vacuum system.

Megohm: 1,000,000 ohms of resistivity.

Measurand: A particular quantity subject to measurement.

Measurement: The act or process of measuring.

Measurement Standards: A material measure, measuring instrument, reference material, or system intended to define, conserve, or reproduce a unit or one or more values of a quantity in order to transmit them to other measuring instruments by comparison.

Measurement Uncertainty: The estimated amount by which the measured quantity may depart from the true value.

Measuring Equipment: All of the measuring instruments, measurement standards, reference materials, auxiliary apparatus, and instructions that are necessary to carry out a measurement. This includes measuring equipment used in the course of that used in calibration.

Meter: The basic unit of length adopted under the Systeme International d’Unites (approximately 1.094 yards)

Metrology: The science of measurement.

MEV: The abbreviation for a million electron volts.

MHO: A unit of conductance.

Micro: Equivalence of one millionth.

Micron: A metric unit of length equal to one millionth of a meter.

Milli: Equivalence of one thousandth.

Minute: 1/60th of a degree.

MKS System: The meter-kilogram-second system.

Model for Quality Assurance: Standardized or selected set of quality system requirements situation.

Moment Arm: The length of a torque wrench from the center of pivot to the point where force is applied.

Momentum: The product of the mass of a body and its velocity.