millimeters
n. plural-onlyn. a very small unit of length. There are ten of these in one centimeter and one thousand in one meter.
n. a metric unit of length equal to one thousandth of a meter. This plural form refers to the measurement or the physical distance itself.
The insect is only five millimeters long.
The carpenter adjusted the shelf by a few millimeters to ensure it was perfectly level.
Precision engineering requires components to be manufactured with tolerances measured in fractions of millimeters to ensure seamless mechanical integration.
As a plural noun, it takes a plural verb when referring to individual units, but often takes a singular verb when referring to a total distance or amount.
The gap is five millimeter wide.The gap is five millimeters wide.When used as a noun to state a measurement, the plural form must be used for amounts greater than one.