whom
Pronunciation:
/huːm//huːm/pronoun
Definitions
(interrogative) What person or people; which person or people.
(relative) Used to refer to a previously mentioned person or people.
Example: He's a person with whom I work. (defining)
(fused relative, archaic outside set patterns) The person(s) whom; whomever.
Example: To whom it may concern, all business of John Smith Ltd. has now been transferred to Floggitt & Runne.