dissert

verb
dis·​sert | \di-ˈsərt \

Definition of dissert 

intransitive verb

: to speak or write at length

First Known Use of dissert

1657, in the meaning defined above

History and Etymology for dissert

Latin dissertus, past participle of disserere, from dis- + serere to join, arrange — more at series

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The first known use of dissert was in 1657

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