Definition of reconnaissance noun from the Oxford Advanced Learner's Dictionary

 

reconnaissance

 noun
noun
BrE BrE//ˈkɒnɪsns//
 
; NAmE NAmE//ˈkɑːnɪsns//
 
(also British English, informal recce)(also US English, informal recon)[countable, uncountable]
 
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the activity of getting information about an area for military purposes, using soldiers, planes, etc. to make an aerial reconnaissance of the island Time spent on reconnaissance is seldom wasted. a reconnaissance aircraft/mission/satellite Wordfindercolonize, discover, explore, pioneer, reconnaissance, scout, settle, terrain, territory, voyage CollocationsWar and peaceStarting a war declare/​make/​wage war (on somebody/​something) go to war (against/​with somebody) cause/​spark/​provoke/​foment/​quell unrest incite/​lead/​crush/​suppress a revolt/​rebellion launch/​mount/​carry out a surprise/​terrorist attack prevent/​halt/​represent an escalation of the conflict be torn apart by/​be on the brink of civil war enter/​invade/​occupy somebody’s territory lead/​launch/​resist/​repel an invasionMilitary operations adopt/​develop/​implement/​pursue a military strategy carry out/​execute/​perform military operations/​manoeuvres/(especially US English) maneuvers send/​deploy/​station/​pull back/​withdraw troops go on/​fly/​carry out a reconnaissance/​rescue mission train/​equip/​deploy army/​military/​combat units lead/​launch/​conduct a raid/​a surprise attack/​an (air/​airborne/​amphibious) assault (on somebody) employ/​use guerrilla tactics conduct/​wage biological/​guerrilla warfare fight/​crush/​defeat the rebels/​the insurgency suffer/​inflict a crushing defeat achieve/​win a decisive victory halt/​stop the British/​German/​Russian advance order/​force a retreatFighting join/​serve in the army/​navy/​air force be/​go/​remain/​serve on active duty serve/​complete/​return from a tour of duty be sent to the front (line) attack/​strike/​engage/​defeat/​kill/​destroy the enemy see/​report/​be engaged in heavy fighting call for/​be met with armed resistance come under heavy/​machine-gun/​mortar fire fire a machine-gun/​mortar shells/​rockets (at somebody/​something) shoot a rifle/​a pistol/​bullets/​missiles launch/​fire a cruise/​ballistic/​anti-tank missile use biological/​chemical/​nuclear weapons inflict/​suffer/​sustain heavy losses/​casualties be hit/​killed by enemy/​friendly/​artillery fire become/​be held as a prisoner of warCivilians in war harm/​kill/​target/​protect innocent/​unarmed civilians cause/​avoid/​limit/​minimize civilian casualties/​collateral damage impose/​enforce/​lift a curfew engage in/​be a victim of ethnic cleansing be sent to an internment/​a concentration camp accept/​house/​resettle refugees fleeing from war fear/​threaten military/​violent reprisals commit/​be accused of war crimes/​crimes against humanity/​genocideMaking peace make/​bring/​win/​achieve/​maintain/​promote peace call for/​negotiate/​broker/​declare a ceasefire/​a temporary truce sign a ceasefire agreement call for/​bring/​put an end to hostilities demand/​negotiate/​accept the surrender of somebody/​something establish/​send (in) a peacekeeping force negotiate/​conclude/​ratify/​sign/​accept/​reject/​break/​violate a peace treaty Word Origin early 19th cent.: from French, from reconnaître ‘recognize’, from Latin recognoscere ‘know again’, from re- ‘again’ + cognoscere ‘learn’.
See the Oxford Advanced American Dictionary entry: reconnaissance