1. (n.) The act of reconnoitering; preliminary examination or survey.

2. (n.) An examination or survey of a region in reference to its general geological character.

3. (n.) 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.

4. (n.) 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.

air cover air raid air support bombing cover dry run examination exploration inspection investigation milk run mission recce recco recon reconnaissance mission reconnoiter reconnoitering scouting scramble scrutiny shuttle raid sortie strafing survey training mission umbrella