Folks -- Replying to Joseph, I use simultaneously three definitions 
of 'information'.  Thus:

a reduction in uncertainty / a constraint on entropy production / a 
difference that makes a difference

With these, meaning is inherent in any constraint as a possibility, 
and any constraint could make a difference somewhere.  So, the 
constraint aspect (e.g., Pattee's contrast between dynamics and 
constraint) subsumes both information and meaning.

Knowledge, however, appears to be a more particular kind of thing -- 
an organization of meanings, a classification.

So, information and meaning are, as it were, pansemiotic, while 
knowledge is an aspect of human (possibly animal) organization.

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