The Constructed Language Hypothesis

[ReneZ]

The problem raised by Tiltman is that known examples of such languages are late, and we now know that they are much later than the creation date of the Voynich MS.
Whether that was also the reason why both Friedman and Tiltman did not seem to have gone anywhere with that idea, I do not know.

To be clear, this objection isn't exactly proof that it could not be a constructed language, but it makes it a more challenging proposal.

For me, it is something that seems prohibitively difficult to approach.

On the other hand, my favourite 'key question'  about the Voynich MS may provide some insight.
That is: in case we could answer this key question.

This is:
Is it possible to do a word-by-word substitution of the Voynich MS and come up with a meaningful text?

I see more reasons why the answer should be "no"  rather than "yes".

If it is "no", then we cannot create a dictionary of Voynichese to some known language.
A constructed language is most easily conceived in the form of a dictionary.

If it is "no", then also all types of ciphers are excluded, even the more complicated diplomatic ones.

Essentially all past proposed meaningful solutions assume that some form of dictionary should exist.