The millimetre (SI symbol: mm; international spelling) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, the SI base unit of length.

As the name suggests, a millimeter is equal to one thousandth of a meter, making it a very small unit of measurement. To put the size of a millimeter into perspective, it is roughly the thickness of a credit …

Apr 7, 2026 · A millimeter (mm) is a unit of measurement. It forms part of the metric system and, although this isn’t the dominant system in the US, you’ll likely use mm units a lot.

May 31, 2025 · A millimeter (also spelled “millimetre”) is a unit of length in the metric system—a system of units that includes centimeters, meters, and kilometers. 1 millimeter is equal to 1/1000 of a meter, …

A millimeter can be defined as a metric unit used to measure the length of small or tiny objects such as measuring lines, the length of a pencil tip, etc. The word is usually expressed as 'mm' and is …

The meaning of MILLIMETER is a unit of length equal to 1/1000 meter.

A millimeter (mm) is a very small unit of length in the metric system, equal to one-thousandth of a meter. It is about the thickness of a dime or a paperclip wire.

Nov 11, 2025 · The millimeter, abbreviated as mm, is a fundamental unit of length within the metric system. It represents a small, precise measurement that is widely used in technical fields and …

metric system, international decimal system of weights and measures, based on the metre for length and the kilogram for mass, that was adopted in France in 1795 and is now used officially in almost all …

(abbreviation mm) Add to word list a unit of measurement of length equal to 0.001 meter (Definition of millimeter from the Cambridge Academic Content Dictionary © Cambridge University Press)