In linguistics, however, numerals are classified according to purpose: examples are ordinal numbers ("first", "second", "third", etc.; from 'third' up, these are also used for fractions), multiplicative numbers ("once", "twice", and "thrice"), multipliers ("single", "double", and "triple"), and distributive numbers ("singly", "doubly", and "triply"). Georgian, Latin, and Romanian (see Romanian distributive numbers) have regular distributive numbers, such as Latin "singuli" "one-by-one", "bini" "in pairs, two-by-two", "terni" "three each", etc. In languages other than English, there may be other kinds of number words. For example, in Slavic languages there are collective numbers which describe sets, such as "pair" or "dozen" in English (see Russian numerals, Polish numerals).