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Synonyms
ex·pa·ti·ate (ĭk-spā́shē-āt́)

[Latin expatiārī, expatiāt-, ex-, ex-, + spatiārī, to spread (from spatium, space).]

intransitive verb: -at·ed, -at·ing, -ates. 

  1. To speak or write at length: expatiated on the subject until everyone was bored.
  2. To wander freely.

derivatives

ex·páti·átion
noun