In a manner relating to or involving archaeology; using methods or principles of archaeological study and practice.
From 'archeologic' plus the adverbial suffix '-ally,' creating a word that describes actions or descriptions done in the style or manner of archaeological practice.
When someone says 'archeologically significant,' they're using this adverb to mean 'in a way that matters to our understanding of ancient things'—it's how scientists qualify their biggest discoveries.
Complete word intelligence in one call. Free tier — 50 lookups/day.