noun
a unit of length in the metric system equal to ten meters
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The construction project required precise measurements, including the use of a decametre for accurate lengths.
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I had to bust out the decametre to measure how long the room was for the new furniture.
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I snagged a decametre from the toolbox to check the size of the backyard for the party.
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Her love for gardening was so immense that she could measure it in decametres.