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AnimeBrainly
The metric unit of length that is equal to one thousandth of a meter is a millimeter. 1 meter = 1000 millimeter

hope this helps
Vividerla
Hello there!

I hope you are having a good day!

I'd be happy to help!


Your question states: A metric unit of length that is equal to one thousandth of a meter is.......

The answer is a millimeter

 A metric unit of length that is equal to one thousandth of a meter is a millimeter.


Hope I helped!

Let me know if you need anything else!

~ Zoe