quantity ( quantities plural )
1 n-var A quantity is an amount that you can measure or count.
...a small quantity of water., ...vast quantities of food..., Cheap goods are available, but not in sufficient quantities to satisfy demand...
2 n-uncount Things that are produced or available in quantity are produced or available in large amounts.
After some initial problems, acetone was successfully produced in quantity...
3 n-uncount You can use quantity to refer to the amount of something that there is, especially when you want to contrast it with its quality.
...the less discerning drinker who prefers quantity to quality...
4 If you say that someone or something is an unknown quantity, you mean that not much is known about what they are like or how they will behave.
unknown quantity phrase v-link PHR He is an unknown quantity for his rivals.
quantity surveyor ( quantity surveyors plural ) A quantity surveyor is a person who calculates the cost and amount of materials and workers needed for a job such as building a house or a road.
Translation English - Cobuild Collins Dictionary
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"