(arithmetic) To apply a procedure for verifying whether an arithmetic operation is probably correct or certainly incorrect using modulo characteristics of the digit 9.

Alternative spelling of 9-1-1

plural of nine-point circle

plural of nine points circle

(geometry) That circle which passes through the feet of the altitudes of a given triangle.

Alternative spelling of nine-point circle

Alternative form of nine day wonder

(US, Canada) Alternative form of 9-1-1

(US, Canada) Alternative form of 9-1-1

plural of nine day wonder