plural of boundary umpire

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

plural of boundary four

(geology) The most ancient time encompassed by a given geological period. / (linguistics) The most recent time encompassed by a given period of time.

(linguistics) The most ancient time encompassed by a given period of time. / (geology) The most recent time encompassed by a given geological period.

A legal or statutory body set up to determine the geographical boundaries of nations, states, parliamentary constituencies or other entities.

(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.

plural of boundary corner

Alternative form of boundary rider

(algebraic topology) The image of the (k + 1)ᵗʰ boundary homomorphism (for a given chain complex).