UN
abbreviation. United nations.
abbreviation. United nations.
-1 prefix 1 added to adjectives and participles and their derivative nouns and adverbs, meaning: a not (unusable). B reverse of (esp. With implied approval etc.) (unselfish; unsociable). 2 (less often) added to nouns, meaning ‘a lack of’, ‘the reverse of’ (unrest; untruth). [old english] usage the number of words that can be formed with this prefix (and with un-2) is virtually unlimited; consequently only a selection can be given here.
-2 prefix added to verbs and (less often) nouns, forming verbs denoting: 1 reversal (undress; unsettle). 2 deprivation (unmask). 3 release from (unburden; uncage). 4 causing to be no longer (unman). [old english] usage see note at un-1.
-3 prefix chem. Denoting ‘one’, combined with other numerical roots nil (= 0), un (= 1), bi (= 2), etc., to form the names of elements based on the atomic number, and terminated with -ium, e.g. Unnilquadium = 104, ununbium = 112. [latin unus one]