From Middle English whomever; equivalent to whom + ever.
whomever (objective case of whoever) (formal)
- Whatever person or persons (as object of verb or preposition).
The letter is addressed to whomever it may concern.
1920, Max Beerbohm, And Even Now:
To impose his will on whomever he sees comfortably settled.
- Who is a subject pronoun. Whom is an object pronoun. To determine whether a particular sentence uses a subject or an object pronoun, rephrase it to use he/she/they or him/her/them instead of who, whom; if you use he, she or they, then you use the subject pronoun who; if you use him, her or them, then you use the object pronoun. The same rule applies to whoever/whosoever/whoso and whomever/whomsoever/whomso.
- Who can also be used as an object pronoun, especially in informal writing and speech (hence one hears not only whom are you waiting for? but also who are you waiting for?), and whom may be seen as (overly) formal; in some dialects and contexts, it is hardly used, even in the most formal settings. As an exception to this, fronted prepositional phrases almost always use whom, e.g. one usually says with whom did you go?, not *with who did you go?. However, dialects in which whom is rarely used usually avoid fronting prepositional phrases in the first place (for example, using who did you go with?).
- The use of who as an object pronoun is proscribed by many authorities, but is frequent nonetheless. It is usually felt to be much more acceptable than the converse hypercorrection in which whom is misused in place of who, as in *the savage whom spoke to me.
whatever person or persons