xi Xerus • Xicak · · · Info · Definitions · Synonyms · Characters · · xi · · Text Latin · · Script 2 · · Length Definitions · · · (noun) the cardinal number that is the sum of ten and one. Synonyms: eleven, 11, XI. · · Noun Definition 1 (noun) the 14th letter of the Greek alphabet. · · Noun Definition 2 (adj) being one more than ten. Synonyms: eleven, 11. · · Adjective Definition 1 Synonyms · · · eleven · · Synonym 1 11 · · Synonym 2 Characters · · i latin small letter i U+0069 x latin small letter x U+0078