The act or quality of talking nonsensically, idly, or at excessive length; foolish or senseless chatter.
From 'blater,' possibly influenced by 'blather' and the suffix '-ation.' The word may derive from or be influenced by Latin-based word formations that add formal-sounding suffixes to informal base words.
This word is almost extinct now, but it's wonderfully pompous—adding '-ation' (normally for serious processes like 'organization' or 'education') to silly-sounding 'blater' creates an amusingly inflated word for empty talk!
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