milestone Milesius • mileway · · · Info · Definitions · Synonyms · Characters · · milestone · · Text Latin · · Script 9 · · Length Definitions · · · (noun) stone post at side of a road to show distances. Synonyms: milepost. · · Noun Definition 1 (noun) a significant event in your life (or in a project). · · Noun Definition 2 Synonyms · · · milepost · · Synonym 1 Characters · · e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073 t latin small letter t U+0074