**Distance** is a numerical description of how far apart objects are. In physics or everyday discussion, distance may refer to a physical length, or an estimation based on other criteria (e.g. "two counties over"). In mathematics, a distance function or metric is a generalization of the concept of physical distance. A metric is a function that behaves according to a specific set of rules, and provides a concrete way of describing what it means for elements of some space to be "close to" or "far away from" each other. In most cases, "distance from A to B" is interchangeable with "distance between B and A".

Read more about Distance: Distance Versus Directed Distance and Displacement, Other "distances"

### Famous quotes containing the word distance:

“Under all conditions well-organized violence seems to him the shortest *distance* between two points.”

—Leon Trotsky (1879–1940)

““I see nobody on the road,” said Alice.

“I only wish I had such eyes,” the King remarked in a fretful tone. “To be able to see Nobody! And at that *distance* too! Why, it’s as much as I can do to see real people, by this light!””

—Lewis Carroll [Charles Lutwidge Dodgson] (1832–1898)

“Remember? We sat on a slab of rock.

From this *distance* in time,

it seems the color

of iris, rotting and turning purpler,

but it was only

the usual gray rock”

—Robert Lowell (1917–1977)