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International Organization for Standardization
International Phonetic Alphabet
International Practical Temperature Scale
international relations
International Style
International System (of Units)
International Telecommunication Union
international telegram
international unit
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international unit
in·ter·na·tion·al u·nit (plural in·ter·na·tion·al u·nits)


noun 
Definition:
 
unit of drug measure: the amount of a hormone or vitamin required to produce a specific response
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