Offensive Operation

Offensive operation – type of operation aimed at neutralizing or annihilating the force potential of an opponent in order to obtain the success needed to impose one’s will and to force him give up using the force.(1)
Offensive operation — a form of conducting combat operations by operational (operational-strategic) units of the armed forces; a set of agreed and interconnected battles, battles, and strikes conducted in a theater of war or a strategic (operational) direction according to a single plan and plan to solve strategic, operational-strategic or operational tasks to defeat a large group the enemy and the capture of areas (objects) of crucial strategic (operational) importance.[Wegener, E., Wegener, H.]
An offensive operation is usually carried out as part of a frontal operation (a strategic offensive of all troops) in cooperation with other armies (fronts, army groups), forces, and means, and in coastal directions - also with the forces and means of the naval forces. An offensive operation can be carried out independently in separate operational (strategic) directions.
Offensive operations can be carried out by associations of one or more types of armed forces.[Fulton, W.] (2)

Sources:

Французько-українсько-англійський міжвидовий словник з тактики та логістики. Dictionnaire interamées de termes tactiques et logistiques français-ukrainien-anglais: [в 2-х т.] / Центр розробки Доктрини застосування Збройних Сил Французької Республіки, Київ p.633

Wegener, E., Wegener, H. (1976). The Soviet Naval Offensive. Annapolis: Naval Institute Press.

Fulton, W. (1985). Major General, Vietnam studies riverine operations 1966-1969. Washington: U.S. Government Printing Office.