reconnoissance

Webster's Dictionary (1913)

Origin: F. See Recognizance.

The act of reconnoitering; preliminary examination or survey. Specifically: (a) Geology An examination or survey of a region in reference to its general geological character. (b) Engineering An examination of a region as to its general natural features, preparatory to a more particular survey for the purposes of triangulation, or of determining the location of a public work. (c) Military An examination of a territory, or of an enemy's position, for the purpose of obtaining information necessary for directing military operations; a preparatory expedition.

Reconnoissance in force Military, a demonstration or attack by a large force of troops for the purpose of discovering the position and strength of an enemy.

Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54