Motivation: words in a dictionary are defined in terms of other words, but at some point it becomes circular: words defined by other words that have also been defined using some of the same words. Thus every dictionary must have a minimum set of words that are not defined but can be used to define the rest of words in the dictionary.
The study should not be that difficult to do, just enumerate all the subsets of words from the smallest to the largest, and see which is the smallest set that suffices to define the rest of the words in the dictionary.
My intuition is that this can perhaps tell us what are the core set of basics concepts that a mind (or a robot) needs to "understand", and the rest can be generated by definitions.
Question: I wonder if somebody can point me to any such study, assuming some exists. Thanks