On grammatical class:

xi
subscript; attaches a number of letteral string following as a subscript onto grammar structures.
te'ai
Exponentiation of unit selbri

In definition:

cmavrxi
x1 is the selma'o "XI".

In notes:

gensima
x1 (text) is a temporary name for x2 (text, object, event) chosen in such a way that it is not used for naming anything else within the current scope