ENThe exponents of quantitative indefiniteness: Polish kilkanaście and Lithuanian keliolika form a lexical linguistic parallel. The meaning of both lexemes, indicating an approximate value in the range from 11 to 19 inclusive, is sporadically noted in natural languages. All examples of the use of these forms extracted from known multilingual parallel corpora or Polish–Lithuanian language pair were subjected to a contrastive analysis. The aim was to determine whether the convergence of the dictionary meanings of the two lexemes is reflected in the use of these forms in mutually corresponding Polish and Lithuanian sentences/segments. Keywords: kilkanaście; keliolika; semantic category of quantity; Polish; Lithuanian; corpus-driven approach. [From the publication]