(historical) The period of Egyptian history from the end of the Middle Kingdom midway through the 13th dynasty to the start of the New Kingdom at the beginning of the 18th dynasty, characterized by political disintegration and later the conquest of Egypt by the Hyksos.

plural of second-order logic

A position in rugby football in the back line.

plural of ten-second car

(informal) A period of intense conflict between the two Koreas in the 1960s, that included the attempted assassination of the South Korean president and the capture of the U.S.S. Pueblo by North Korea.

plural of second five-eighth

by extension, escape velocity of the home body

escape velocity of Earth (interplanetary speed)

A measure of kinematic viscosity used in classical mechanics: the time taken by 60 cm³ of oil to flow through a calibrated tube at a controlled temperature of 38°C.

plural of Saybolt universal second