ellipsis (rhetoric)
Definition - The rhetorical figure of omitting a word or phrase that is easily inferred from the context.

1. According to the OED, someone who is addicted to using ellipsis in argument or discourse is called an ellipsist.

Example -
The average banker thinks he isn't.
(In the above the word average is not repeated but is understood to follow the word isn't.)

Etymology -
The term derives from the Greek elleipsis, a leaving out.

Oxford English Dictionary -
Its first citation is from 1612:
"The first of the Substantives is oft understood by a figure called Ellipsis."
(Brinsley Pos. Parts (1669) 67)

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