# Definitions and Synonyms of *boundary* | Another word for *boundary* | What is *boundary? *

*Definition 1: the greatest possible degree of something - [noun denoting attribute]*

*Samples where boundary or its synonyms are used according to this definition*

*what he did was beyond the bounds of acceptable behavior**to the limit of his ability*

*Synonyms for boundary in the sense of this definition*

*(**boundary* is a kind of ...) the distance or area or volume over which something extends

*boundary*is a kind of ...) the distance or area or volume over which something extends

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*"the vast extent of the desert"**"an orchard of considerable extent"*### (... is a kind of *boundary* ) a narrow boundary

*"he lived on a knife-edge between genius and insanity"*### (... is a kind of *boundary* ) the quality of being complete or utter or extreme

*"the starkness of his contrast between justice and fairness was open to many objections"*### (... is a kind of *boundary* ) a limit to high speed flight imposed by aerodynamic heating

### (... is a kind of *boundary* ) the greatest possible degree

*"he tried his utmost"*### (... is a kind of *boundary* ) the limit beyond which something happens or changes

*"on the verge of tears"**"on the brink of bankruptcy"**Definition 2: the line or plane indicating the limit or extent of something - [noun denoting location]*

*Synonyms for boundary in the sense of this definition*

*(**boundary* is a kind of ...) the outermost or farthest region or point

*boundary*is a kind of ...) the outermost or farthest region or point

*(... is a kind of **boundary* ) the natural margin formed by hair on the head

*boundary*) the natural margin formed by hair on the head

*(... is a kind of **boundary* ) the extended two-dimensional outer boundary of a three-dimensional object

*boundary*) the extended two-dimensional outer boundary of a three-dimensional object

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*"they skimmed over the surface of the water"**"a brush small enough to clean every dental surface"**"the sun has no distinct surface"*### (... is a kind of *boundary* ) the line that appears to bound an object

### (... is a kind of *boundary* ) the boundary of a specific area

### (... is a kind of *boundary* ) a boundary marking the extremities of something

*"the end of town"*### (... is a kind of *boundary* ) the boundary of a surface

### (... is a kind of *boundary* ) the boundary of a city

### (... is a kind of *boundary* ) the boundary between two counties

### (... is a kind of *boundary* ) the boundary between two districts

### (... is a kind of *boundary* ) an archaic term for a boundary

### (... is a kind of *boundary* ) a line that indicates a boundary

### (... is a kind of *boundary* ) the boundary marking the edge of the sun's influence; the boundary (roughly 100 AU from the sun) between the interplanetary medium and the interstellar medium; where the solar wind from the sun and the radiation from other stars meet

### (... is a kind of *boundary* ) an international boundary or the area (often fortified) immediately inside the boundary

### (... is a kind of *boundary* ) a boundary line between land and water

### (... is an instance of *boundary*) the boundary in ancient times between Italy and Gaul; Caesar's crossing it with his army in 49 BC was an act of war

### (... is an instance of *boundary*) the boundary between the Earth's crust and the underlying mantle

*"the Mohorovicic discontinuity averages 5 miles down under oceans and 20 miles down under continents"**Definition 3: a line determining the limits of an area - [noun denoting shape]*

*Synonyms for boundary in the sense of this definition*

*(**boundary* is a kind of ...) a length (straight or curved) without breadth or thickness; the trace of a moving point

*boundary*is a kind of ...) a length (straight or curved) without breadth or thickness; the trace of a moving point

*(... is a kind of **boundary* ) the shape of a raised edge of a more or less circular object

*boundary*) the shape of a raised edge of a more or less circular object

*(... is a kind of **boundary* ) the boundary line or the area immediately inside the boundary

*boundary*) the boundary line or the area immediately inside the boundary

*(... is a kind of **boundary* ) the outside boundary or surface of something

*boundary*) the outside boundary or surface of something

*(... is a kind of **boundary* ) a region marking a boundary

*boundary*) a region marking a boundary

*(... is a kind of **boundary* ) (mathematics) a number equal to or greater than any other number in a given set

*boundary*) (mathematics) a number equal to or greater than any other number in a given set

*(... is a kind of **boundary* ) (mathematics) a number equal to or less than any other number in a given set

*boundary*) (mathematics) a number equal to or less than any other number in a given set

*(... is a kind of **boundary* ) the middle of the chief navigable channel of a waterway that forms the boundary line between states

*boundary*) the middle of the chief navigable channel of a waterway that forms the boundary line between states

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