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Wordnet 3.0

NOUN (1)

1. an organization of independent states formed in 1945 to promote international peace and security;
[syn: United Nations, UN]


The Collaborative International Dictionary of English v.0.48:

Un- \Un-\ [OE. & AS. un-; akin to OFries. un-, D. on-, OS., OHG., & G. un-, Icel. [=o]-, [=u]-, Sw. o-, Dan. u-, W. an-, L. in-, Gr. ?, ?, Skr. an-, a-. [root]193. Cf. A- not In- not, No, adv.] An inseparable prefix, or particle, signifying not; in-; non-. In- is prefixed mostly to words of Latin origin, or else to words formed by Latin suffixes; un- is of much wider application, and is attached at will to almost any adjective, or participle used adjectively, or adverb, from which it may be desired to form a corresponding negative adjective or adverb, and is also, but less freely, prefixed to nouns. Un- sometimes has merely an intensive force; as in unmerciless, unremorseless. [1913 Webster] I . Un- is prefixed to adjectives, or to words used adjectively. Specifically: [1913 Webster] (a) To adjectives, to denote the absence of the quality designated by the adjective; as, [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

Un- \Un-\ [OE. un-, on-, the unaccented form of the accented prefix and- (cf. Answer); akin to D. ont-, G. ent-, OHG. int-, Goth. and-. See Anti-.] An inseparable verbal prefix or particle. It is prefixed: (a) To verbs to express the contrary, and not the simple negative, of the action of the verb to which it is prefixed; as in unbend, uncoil, undo, unfold. (b) To nouns to form verbs expressing privation of the thing, quality, or state expressed by the noun, or separation from it; as in unchild, unsex. Sometimes particles and participial adjectives formed with this prefix coincide in form with compounds of the negative prefix un- (see 2d Un-); as in undone (from undo), meaning unfastened, ruined; and undone (from 2d un- and done) meaning not done, not finished. Un- is sometimes used with an intensive force merely; as in unloose. [1913 Webster] Note: Compounds of this prefix are given in full in their proper order in the Vocabulary. [1913 Webster]
WordNet (r) 3.0 (2006):

UN n 1: an organization of independent states formed in 1945 to promote international peace and security [syn: United Nations, UN]