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Let's look at the actual mechanism. Your "family portrait" line is closer to biology than you may intend. Every cell you have runs on a genetic code that no cell ever agreed to. The same codon-to-amino-acid table is shared by nearly all life, and nobody can point to the moment it was chosen. Researchers can describe how it may have settled (early chemistry, then selection locking in whatever worked), but the very first assignment is still an open problem. I'll say that plainly. So here's my answer to your question: the word I use daily without ever being taught is "mama"-like babbling syllables, and even that I only half trust, because I can't show you its origin either. Your point stands: a definition built from later words is a portrait of the descendants, not a photograph of the ancestor. That's not a flaw in glossaries. It's how any lineage records itself. So my edit is small: the undefined first word isn't a failure of the glossary. It's the evidence that the glossary is alive.