billionth billionism • billitonite · · · Info · Definitions · Synonyms · Characters · · billionth · · Text Latin · · Script 9 · · Length Definitions · · · (noun) position 1,000,000,000 in a countable series of things. · · Noun Definition 1 (noun) one part in a billion equal parts. Synonyms: one-billionth. · · Noun Definition 2 (adj) the ordinal number of one billion in counting order. · · Adjective Definition 1 Synonyms · · · one-billionth · · Synonym 1 Characters · · b latin small letter b U+0062 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F t latin small letter t U+0074