unknown
1. A code meaning “information not available.” 2. An unidentified target. An aircraft or ship that has not been determined to be hostile, friendly, or neutral using identification friend or foe and other techniques, but that must be tracked by air defense or naval engagement systems. 3. An identity applied to an evaluated track that has not been identified. See also assumed friend; friend; hostile; neutral; suspect. unlimited war. Not to be used. See general war.

Military dictionary. 2000.

Synonyms:

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  • Unknown — may refer to: * a lack of knowledge * a variable to be solved for in a mathematical equation * an actor or footballer or singer who is not yet famous * John Doe, an unknown person* Unknown unknown, an unanticipated uncertainty in a formal… …   Wikipedia

  • unknown — ► ADJECTIVE ▪ not known or familiar. ► NOUN ▪ an unknown person or thing. ● unknown to Cf. ↑unknown to …   English terms dictionary

  • unknown — [unnōn′] adj. not known; specif., a) not in the knowledge, understanding, or acquaintance of someone; unfamiliar (to) b) not discovered, identified, determined, explored, etc. n. 1. an unknown person or thing 2. an unknown mathematical quantity:… …   English World dictionary

  • unknown — (adj.) c.1300, strange, unfamiliar (of persons, places), from UN (Cf. un ) (1) not + pp. of KNOW (Cf. know). Cf. O.E. ungecnawen. In ref. to facts, attested from early 14c. The noun meaning unknown person is recorded from 1590s …   Etymology dictionary

  • Unknown — Un*known , a. Not known; not apprehended. {Un*known ness}, n. [R.] Camden. [1913 Webster] …   The Collaborative International Dictionary of English

  • unknown — index anonymous, blind (concealed), clandestine, covert, defunct, disputable, hidden, inexplicable …   Law dictionary

  • unknown — [adj] obscure, mysterious alien, anonymous, concealed, dark, desolate, distant, exotic, far, faraway, far off, foreign, hidden, humble, incog*, incognito, little known, nameless, new, remote, secret, so and so*, strange, such and such*,… …   New thesaurus

  • unknown — {{Roman}}I.{{/Roman}} noun 1 place/thing that you know nothing about ADJECTIVE ▪ big, great ▪ What the weather will be like on the day is, as always, the great unknown. VERB + UNKNOWN ▪ explore, face …   Collocations dictionary

  • unknown — [[t]ʌ̱nno͟ʊn[/t]] ♦♦♦ unknowns 1) ADJ If something is unknown to you, you have no knowledge of it. An unknown number of demonstrators were arrested... How did you expect us to proceed on such a perilous expedition, through unknown terrain... The… …   English dictionary

  • unknown — un|known1 W2 [ˌʌnˈnəun US ˈnoun] adj, adv 1.) not known about ▪ The murderer s identity remains unknown . ▪ For some unknown reason , Mark quit his job and moved to Greece. ▪ a voyage through unknown territory ▪ An unknown number of people were… …   Dictionary of contemporary English

  • unknown — I UK [ʌnˈnəʊn] / US [ʌnˈnoʊn] adjective ** 1) if something is unknown, people do not know about it or do not know what it is Several hundred people were affected by the previously unknown virus. be unknown to someone: Most of her friends are… …   English dictionary

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