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definitions

equi NP deletion

noun Linguistics.

a rule of transformational grammar that deletes the underlying subject of a complement clause if it is coreferential with the subject or object of the main clause, as in John promised to return the money, where the underlying subject (John) of return has been deleted.

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Origin of equi NP deletion

apparently short for equivalent NP
Also called equi.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019