none (the concept)

The concept of "none" refers to the absence or lack of anything within a particular context. It signifies that there is no object, quantity, or presence matching the subject in question. For example, if a container holds "none" of a substance, it is empty. In logic or mathematics, "none" indicates zero or no elements in a set. It is a fundamental idea used to describe emptiness, non-existence, or the absence of a property, helping to clarify situations where nothing is present or applicable.