Definition of ergo adverb from the Oxford Advanced American Dictionary

 

ergo

 adverb
adverb
NAmE//ˈərɡoʊ//
 
, NAmE//ˈɛrɡoʊ//
 
(from Latin)(formal or humorous)
 
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therefore Change from within will take too long. Ergo change must come from outside.
See the Oxford Advanced Learner's Dictionary entry: ergo