Толковый словарь английского языка Oxford English Reference - dual

adj., n., & v. --adj. 1 of two; twofold. 2 divided in two; double (dual ownership). 3 Gram. (in some languages) denoting two persons or things (additional to singular and plural). --n. (also dual number) Gram. a dual form of a noun, verb, etc. --v.tr. (dualled, dualling) Brit. convert (a road) into a dual carriageway. Phrases and idioms dual carriageway Brit. a road with a dividing strip between the traffic in opposite directions. dual control (of a vehicle or an aircraft) having two sets of controls, one of which is used by the instructor. dual in-line package Computing see DIP. dual-purpose (of a vehicle) usable for passengers or goods. Derivatives duality n. dualize v.tr. (also -ise). dually adv. Etymology: L dualis f. duo two