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Definitions from WordNet

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Millimetre

Noun: A millimetre is a unit of length in the metric system, equal to one thousandth of a meter.

Sense 1: A millimetre refers to a measurement unit used in scientific, engineering, and manufacturing applications.

Sample Sentence 1: To ensure accuracy, the engineer measured the thickness of the metal sheet to the nearest millimetre.

Sample Sentence 2: The precision cutting tool can accurately slice through materials with a thickness of a few millimetres.

Sense 2: A millimetre can also refer to a tiny distance or measurement, often used figuratively.

Sample Sentence 1: The ladybug in the garden seemed only a millimetre away from being crushed by the child's foot.

Sample Sentence 2: The team missed qualifying for the tournament by a millimetre, causing disappointment and frustration.

Sense 3: In local dialects and some informal settings, "millimetre" is used colloquially to refer to a person who is extremely particular or nitpicky about small details.

Sample Sentence 1: John is such a millimetre when it comes to arranging his bookshelves perfectly in alphabetical order.

Sample Sentence 2: Don't be such a millimetre, it's not the end of the world if your tie doesn't match exactly with your socks.