The jargon-forming interpretation of Zipf's Law may be a cause of multiple meanings of words in the natural languages, especially of short words. If true, it threatens the Lojban rule that all lujvo must have one meaning. This doesn't lead to ambiguity, as it might seem. A given lujvo still has exactly one meaning and place structure. But now, more than one tanru is competing for the same lujvo.
Someone has to use judgement in deciding which one meaning is to be chosen over the others.
This judgement will be made on the basis of usage, presumably by some fairly logical criteria. If the lujvo made by a shorter form of tanru is already in use, or is likely to be useful for another meaning, the wordmaker then retains one or more of the cmavo, preferably ones that clearly set this meaning apart from the shorter form meaning that is used or anticipated. In Lojban, therefore, shorter lujvo will be used for a less complicated concept, possibly even over a more frequent word. If two concepts compete for a single rafsi sequence, the simpler concept will take a shorter form, and the more complex concept will have some indication of its more complex nature added into the word structure. It is easier to add a cmavo to clarify the meaning of a more complex term than it is to find a good alternate tanru for the simpler term.