This meaning refers to how much or how many of something exists, is used, or is needed.
We need a large quantity of water.
Only a small quantity was available.
In science and mathematics, this meaning refers to a measurable value such as length, time, mass, or temperature.
Length and mass are physical quantities.
Each quantity must be recorded with the correct unit.
Core substantive noun used across general discourse and written English.
A detailed understanding of quantity is essential for this field of study.
They examined the role of quantity within the wider community.