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pro·formor pro-form (prō′fôrm′)
An item in a sentence, typically a pronoun, verb, or adverb, that substitutes for a constituent phrase or clause, as the words he and so in the sentence He said so, with the pronoun he replacing a noun phrase such as the president and the adverb so replacing a clause such as that he would leave today.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Grammar) a word having grammatical function but assuming the meaning of an antecedent word or phrase for which it substitutes: the word "does" is a pro-form for "understands Greek" in "I can't understand Greek but he does".
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a word used to replace or substitute for a word, phrase, or clause belonging to a given grammatical class, as a pronoun used to replace a noun or noun phrase, there used to replace an adverbial phrase of place, or so used to substitute for a clause, as in Have they gone? I think so.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
pro-form[ˈprəʊˌfɔːm] N (Ling) → pro forma f
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005