Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: exspatiatus, past paticiple of exspatiari 'to wander freely', from spatium 'space'

expatiate

 verb
     
ex‧pa‧ti‧ate

expatiate on/upon something

phrasal verb
formal to speak or write in detail about a particular subject
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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