American English

Definition of whom pronoun from the Oxford Advanced American Dictionary

  

whom

 pronoun
pronoun
NAmE//hum//
 
(formal)
 
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 used instead of “who” as the object of a verb or preposition Whom did they invite? To whom should I write? The author whom you criticized in your review has written a reply. Her mother, in whom she confided, said she would support her unconditionally.
GrammarwhomWhom is not always used in spoken English. Who is often used as the object pronoun, especially in questions:Who did you invite to the party?Whom is used as the pronoun after prepositions in written English and formal spoken English:To whom should I address the letter? He asked me with whom I had discussed it.In spoken English, it is more accepted to use who and put the preposition at the end of the sentence:Who should I address the letter to? He asked me who I had discussed it with.In defining relative clauses, the object pronoun whom is often replaced in speaking or informal writing with who, or you might leave out the pronoun completely:The family (who/that/whom) I met at the airport were very kind.In nondefining relative clauses, whom is used and the pronoun cannot be left out:Our doctor, whom we all liked very much, retired last week.In speaking and informal writing, who is sometimes used instead.
See the Oxford Advanced Learner's Dictionary entry: whom