There are 2 definitions of UN in English:

UN1

Line breaks: UN
Pronunciation: /juːˈɛn
 
/

abbreviation

United Nations.

Definition of UN in:

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Word of the day envenom
Pronunciation: ɪnˈvɛnəm
verb
put poison on or into; make poisonous

There are 2 definitions of UN in English:

un-2

prefix

Added to verbs:
1Denoting the reversal or cancellation of an action or state: untie unsettle
2Denoting deprivation, separation, or reduction to a lesser state: unmask unman
2.1Denoting release: unburden unhand

Origin

Old English un-, on-, of Germanic origin; related to Dutch ont- and German ent-.

Definition of UN in: