The authoress describes semantic features of ten Polish expressions: masa, moc, kupa, fura, odrobina, ociupina, kapka, garstka, garsc and szereg. Semantic structures of these numerals include three components. The first one denotes the fact that the quantity of something can be specified only in an approximate way. The next component shows that the quantity of something is large or small. And the third one refers to the speaker's intention. According to these components, three groups of analyzed numerals can be distinguished. Lexemes: masa, moc, kupa and fura, which describe a large quantity of something, belong to the first group. There are expressions: odrobina, ociupina, kapka and garstka, which mean a small quantity of something, in the second group. The third group includes numerals which do not describe how much or how little of something is there. Expressions: garsc and szereg belong to it.