Definition from macmillandictionary.com
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Cut the cloth to the required length.
This beautiful bird is small, with a total length of about three inches.
The length of your swimming pool is not important.
Use two planks of unequal length.
The boat was 16 feet in length.
The length of your talk must be at least 10 minutes.
The average length of stay in hospital is three days.
You can adjust the length of time that the light remains on.
When standing for any length of time, remember to flex your knees.
His latest novel is twice the length of his previous one.
Carter ran half the length of the pitch to score a brilliant goal.
The pier was lit up along its entire length.
A proposed tourist trail will run the length of the river.
a length of pipe/rope/string
He still managed to finish seven lengths ahead of the rest.