kilometer What is the Definition of kilometer?Noun:a metric unit of length equal to 1000 meters (or 0.621371 miles) Other meanings of kilometer (synonyms, cognates). ENRU kilometer километр Frequently viewed: information meaningunclear definitionsimilar meaningtax meaningsold meaningsibling meaningspeed in a sentencevary definitionalter meaningrun meaningtent in a sentencenone meaning A B C D E F G H I J K L M N O P Q R S T U V W X Y Z