Home › Words › N › ninerniner/ˈnaɪnə(ɹ)/niner means something nine inches long, or holding nine gallons, etc.Among words judged in Lexicurio's Arena, niner ranks #10,326 of 42,752 for Qualifying.niner is pronounced /ˈnaɪnə(ɹ)/.Etymology(1): From nine + -er.nounSomething nine inches long, or holding nine gallons, etc.The digit 9 in the NATO phonetic alphabet.Definitions & examples from Wiktionary (CC BY-SA 3.0).