 
		
		Definition of declension:
		
		
		(n) :
		
		a way of categorizing 
nouns, 
pronouns, or 
adjectives according to the inflections they receive; the act of 
declining a word; the act of listing the 
inflections of a noun, pronoun or adjective in order
		
 
								
				"in Latin, 'amicus' belongs to the second declension. Most second-declension nouns end in 'i' in the genitive singular and 'um' in the accusative singular."