Dictionary.com
Thesaurus.com

whom

American  
[hoom] / hum /

pronoun

  1. the objective case of who.

    Whom did you call? Of whom are you speaking? With whom did you stay?

  2. the dative case of who.

    You gave whom the book?


whom British  
/ huːm /

pronoun

  1. the objective form of who , used when who is not the subject of its own clause

    whom did you say you had seen?

    he can't remember whom he saw

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Usage

It was formerly considered correct to use whom whenever the objective form of who was required. This is no longer thought to be necessary and the objective form who is now commonly used, even in formal writing: there were several people there who he had met before . Who cannot be used directly after a preposition – the preposition is usually displaced, as in the man ( who ) he sold his car to . In formal writing whom is preferred in sentences like these: the man to whom he sold his car . There are some types of sentence in which who cannot be used: the refugees, many of whom were old and ill, were allowed across the border

Commonly Confused

See who .

Etymology

Origin of whom

First recorded before 900; Middle English; Old English hwām, dative of interrogative pronoun hwā who

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The company has since said that it has severed ties with both agencies, and responded to other concerns by giving communities more power to decide whom to grant access to state or nationwide lookup networks.

From Los Angeles Times

By donating the equipment, neighborhood groups may get to control what type of technology is installed and by whom.

From Los Angeles Times

Opalite features Norton, Gleeson, Capaldi, and a cameo voiceover from Irish actor Cillian Murphy, all of whom appeared on The Graham Norton Show with Swift in October.

From BBC

Khomeini would become his mentor, a figure to whom he remained ever loyal, running secret missions for him while Khomeini lived in exile.

From Los Angeles Times

To whom did they make car payments?

From The Wall Street Journal