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The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length. Therefore, there are one thousand millimetres in a metre.
Millimeter is predominantly used in American (US) English (en-US) while millimetre is predominantly used in British English (used in UK/AU/NZ) (en-GB). In terms of actual appearance and usage , here's a breakdown by country, with usage level out of 100 (if available) 👇:
A millimetre (American spelling: millimeter, symbol mm) is one thousandth of a metre, which is the International System of Units (SI) base unit of length. The millimetre is part of a metric system. A corresponding unit of area is the square millimetre and a corresponding unit of volume is the cubic millimetre.
Millimetre (mm), unit of length equal to 0.001 metre in the metric system and the equivalent of 0.03937.
- The Editors of Encyclopaedia Britannica
Millimetre (mm - Metric), length. A millimetre (American spelling: millimeter, symbol mm) is one thousandth of a metre (the metre is the International System of Units (SI) base unit of length). The millimetre is part of a metric system.
mil· li· me· ter ˈmi-lə-ˌmē-tər. variants US millimeter or British millimetre. : a unit of length equal to ¹/₁₀₀₀ meter see Metric System Table. Examples of millimeter in a Sentence.
B1. a unit of length that is equal to 0.001 meters. Examples. The plastic is 2 millimeters thick. They can measure the plant growth in millimeters. We had to move the stone a few millimeters to the left. SMART Vocabulary: related words and phrases.
