mekso at-most-3-ary operator: convert to polynomial; X_{1} (ordered list of algebraic structure (probably field) elements) forms the (ordered list of) coefficients of a polynomial/Laurent-like series with respect to indeterminate X_{2} under ordering rule X_{3} (default for finite list: the first entry is the coefficient of the highest-degree term and each subsequent entry is the next lesser-degree coefficient via counting by ones and wherein the last entry is the constant term)

In English, there is no good way to distinguish between x^{2 + 2x} as a function and as a number; typical notation would demand that it is a number but abuse must be adopted since no easy alternative exists for its expression as a function (such as when it is being defined; mapping notation is one of the best options, but is cumbersome). Lojban now allows for such functionality: just apply this word to the ordered list (1,2,0) and do not fill the second terbri (X_{2}: the indeterminate). This word can also be viewed as creating an object in a ring. Termination of the list is extremely important; under normal interpretations, list entries can themselves have operations applied internally; moreover, multiple indetermimates can be introduced by careful application of this word to a list wherein each entry is itself treated as a polynomial. The last entry in X_{1} must be 'constant' term (when understood as a function), so care must be taken to explicitly mention an appropriate number of zeroes. See also: "cpolinomi'a", "po'i'ei".

- po'i'ei
*(exp!)* - n-ary mekso operator: for an input of ordered list of ordered pairs ((X
_{1, Y}, it outputs formal generalized rational function (x - X_{1)^Y}in the adjoined indeterminate (here: x). - cpolinomi'a
- x
_{1}is a formal polynomial with coefficients x2 (ordered list) of degree x_{3}(li; nonnegative integer) over structure/ring x_{4}(to which coefficients x_{2}all belong) and in indeterminant x_{5}.