boundary

IPA: bˈaʊndɝi

The dividing line or location between two areas.
(figurative, often in the plural) The bounds, confines, or limits between immaterial things (such as one’s comfort zone, privacy, or professional sphere and the realm beyond).
(cricket) An edge or line marking an edge of the playing field.
(cricket) An event whereby the ball is struck and either touches or passes over a boundary (with or without bouncing), usually resulting in an award of 4 (four) or 6 (six) runs respectively for the batting team.
(topology) (of a set) The set of points in the closure of a set S, not belonging to the interior of that set.

Examples of "boundary" in Sentences

The term boundary fence — not a wall, people can hide behind walls — was a misnomer.
The term boundary fence -- not a wall, people can hide behind walls -- was a misnomer.
A woman who crosses the one social boundary is presumed to have crossed all others, too.
Such a sharp distinction — either compelling or irrational — suggests a difficulty in boundary cases.
One example is the use of the word "boundary," meaning a shot that's gone over the boundary for four or six runs.
The northern boundary is not so obvious as the area between Arlingbachweg, a narrow lane, and the Arlingbach stream is heavily wooded.
If the quantum-classical boundary is non-random yet lawless, then an explanation for free will exists which conforms to the perceptions of the people who exercise it.
IIRC, the closest a rig has been (in Cuban waters) to the US-Cuban economic boundary is over 25 Km. Nobody, but NOBODY drills an exploratory well with a 25 Km lateral departure.
Here's a quick review: To create a multipart message, use the Content-type of multipart/alternative and a boundary that contains unique alphanumeric text to designate the HTML and text portions of the e-mail. $boundary = "= = MP_Bound_xyccr948x = ="; $headers =