Research Code Key
[E] Explanation [O] Opinion [W] Website [R] Further Research [Q] Quotation [U] Useful [!] Critical
[X] Exhibition [T] Timeline [I] Important [>] Indent
[P] Photograph [B] Book To Read

[W] https://en.wiktionary.org/wiki/semiosphere

Though not a completely reliable source the definition is useful and contains reference to a reliable source

semiosphere

English

Noun

semiosphere (plural semiospheres)

(semiotics) The sphere of semiosis in which the sign processes operate in the set of all interconnected Umwelts.  

2003 Iu. M. Lotman, Edna Andrews – Conversations With Lotman: Cultural Semiotics in Language, Literature, and Cognition

Lotman’s conceptualization of the semiosphere was inspired by Vernadsky’s and Teilhard de Chardin’s vision of the biosphere and the noosphere.