Etymology
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Words related to reconnaissance

recognizance (n.)

early 14c., reconisaunce, in law, "a bond acknowledging some obligation binding one over to do some particular act," from Old French reconissance "acknowledgment, recognition" (12c., Modern French reconnaissance), from reconoiss-, present-participle stem of reconoistre (see recognize).

By c. 1400 as "acknowledgment of subjection or allegiance" (to God or a temporal power). The general sense of "act of recognizing, acknowledgement of a person or thing" is from 15c. To be discharged or released (up)on (one's) own recognizance (1851) as a phrase for "be released without bail on condition of good behavior" in the jargon of police blotters and district courts, is based on the written promise that you sign to get it, to appear in court as required. Related: Recognizant.

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*gno- 

*gnō-, Proto-Indo-European root meaning "to know."

It forms all or part of: acknowledge; acquaint; agnostic; anagnorisis; astrognosy; can (v.1) "have power to, be able;" cognition; cognizance; con (n.2) "study;" connoisseur; could; couth; cunning; diagnosis; ennoble; gnome; (n.2) "short, pithy statement of general truth;" gnomic; gnomon; gnosis; gnostic; Gnostic; ignoble; ignorant; ignore; incognito; ken (n.1) "cognizance, intellectual view;" kenning; kith; know; knowledge; narrate; narration; nobility; noble; notice; notify; notion; notorious; physiognomy; prognosis; quaint; recognize; reconnaissance; reconnoiter; uncouth; Zend.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit jna- "know;" Avestan zainti- "knowledge," Old Persian xšnasatiy "he shall know;" Old Church Slavonic znati "recognizes," Russian znat "to know;" Latin gnoscere "get to know," nobilis "known, famous, noble;" Greek gignōskein "to know," gnōtos "known," gnōsis "knowledge, inquiry;" Old Irish gnath "known;" German kennen "to know," Gothic kannjan "to make known."

recce 

1941, World War II military slang, short for reconnaissance (n.). As a verb by 1943. The World War I military slang term for the noun was recco (1917). Also compare recon.

recon 

military slang shortening; 1918 for reconnaissance (n.); 1966 for reconnoiter (v.).