Usage Note
Milímetro is stressed on the second syllable (accent on 'í'). The abbreviated form is mm in writing. The idiom no ceder un milímetro — not to give a millimetre — means to hold one's position completely. In everyday precision contexts, milímetro is masculine and forms a regular plural milímetros.
Examples
"Hay que cortar con precisión al milímetro."
Natural Translation
You have to cut with millimetre precision.

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