- A little word showing structure rather than carrying content meaning.
In fact most of cmavo do carry meaning (although elidable terminators don't; they are true structure words). Many carry meaning as their sole purpose; for example, numbers, lerfu (literally "letters"), and everything in selma'o (class of words) UI. But it is true that the cmavo as a class determine the syntax of sentences.
The current cmavo list is available, but it isn't very easy to read!