Reconnaissance is going out to see where the enemy is. Aerial reconnaissance, a reconnaissance patrol, carry out reconnaissance.
Time spent on it is seldom wasted is the old army saying, and it holds outside soldiering too. The word is shortened to recce in Britain and recon in America, and both are pronounced nothing like the French original.
1nounreconnaissanceGoing out to see where the enemy is.
“A small team crept forward at night on a reconnaissance mission behind enemy lines.”
reconnaissance is a survey.
Also accepted in games: recon
French reconnaissance means recognition, from reconnaitre, to recognise, from Latin recognoscere. Recognizance is the same word by another route.
French
reconnaissance — recognition
English, today
reconnaissance
French reconnaissance (“recognition”). a doublet of recognizance.
Etymology from Wiktionary, CC BY-SA