Dictionary Definition: 

“An organic compound derived from ammonia by replacement of one or more hydrogen atoms by organic groups.”

Selected from OxfordDictionaries.com

Functional Definition:

Amines are compounds with the basic structure -N(R)3 and originate from ammonia (NH3). Amine derived compounds are prevalent in our every day lives and in our areas of study. For example the fungicide EDA is commercially used in agriculture to prevent rusts, blights and mildews.

Some examples of amines are shown bellow along with their IUPAC names.

Figure courtesy of Fvasconelloas of Wikipedia Commons