Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: hwam

whom

pronoun
     
whom W1
XX the object form of 'who', used especially in formal speech or writing:
Desperate for money, she called her sister, whom she hadn't spoken to in 20 years.
She brought with her three friends, none of whom I had ever met before.
! Whom is very formal. It is more usual to use who: Who did you send it to? | This is Liz, who I work with.

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