Does the meaning of words change over time?

What are these plots?

Meaning (semantics) can be influenced by context (pragmatics). What we have here are the top 5 words that cause a positive correlation to the overall semantics by their proximity to the keywords. As the words that have the most influence are mostly constant over time, this suggests a change in emotional response to the keywords over time. Notice anti-correlations.

What words are co-located with: australia, australian, aussie, australians

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