Definition of USN in English:

USN

Line breaks: USN
Pronunciation: /juːɛsˈɛn
 
/

abbreviation

United States Navy.

Definition of USN in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up