Definition: A fundamental, generic term used when referring to the measurement (count, amount) of a scalar, vector, number of items or to some other way of denominating the value of a collection or group of items.

Alright class, settle down, let’s take a look! Today we're tackling 'quantity,' and it’s a word that's quite key, It’s about how much is there, for you and me! The dictionary gives us a big, helpful plea: "A fundamental term, for all to see!" Let's break it down in a way nice and slow, Think of ‘quantity’ as helping numbers grow. It can be the count of apples bright red, Or how many students sitting in your head! It could be an amount , like sugar sweet, Or a vector’s length, precise and neat! A scalar value? Just a single score, Like temperature rising, wanting more! Essentially, it's about how many things reside, Or the size of something – let your knowledge ride! It can be for items, groups, or even space, Giving us a measure with elegant grace. So, ‘quantity’ is all about measuring the “how” - Do you understand it now? Let me know! Now, who wants to give an example?