Definable

The concept of “Internet addiction” implies that “the Internet” is some sort of definable activity.

Isolated material particles are abstractions, their properties being definable and observable only through their interaction with other systems.

That Space, as our mathematicians have it, is spoken of as having three dimensions, which one may call Length, Breadth, and Thickness, and is always definable by reference to three planes, each at right angles to the others.

Many words are definable by using other words.

He speaks to an audience definable not by its size nor even by its color but by its intellectual jazzhead zeal, and if he sometimes appears to be speaking only to himself, so be it; few people I know have the fervor for anything to match Mackey’s for jazz.