A storm-scale or mesoscale boundary separating thunderstorm-cooled air (outflow) from the surrounding air, with a similar effect to a cold front.

plural of boundary-rider

One of 44 counties in Idaho, United States. County seat: Bonners Ferry.

(mathematics) Any of a set of constraints that limit the solutions of a differential equation

plural of boundary condition

plural of boundary term

(sociology) A word or phrase that is used for othering; a term that serves to identify someone or something as other than the speaker.

plural of boundary four

(cricket) A four scored by hitting the ball past the boundary (rather than an all-run four)

(American football) A defensive position, responsible for covering the deep half of the field on the boundary side. / The corner where two boundary lines meet.