What is the meaning of Mikä?

what, which

which, that, what

the previous clause or sentence (joka is used instead with individual words or phrases)

superlative or a noun modified by a superlative

a pronoun not referring to a person (for a person, joka is used), when referring to a broadly abstract or undefined concept (as opposed to joka for concrete, well-defined concepts)

when used as a kind of independent relative pronoun which has no referent in the previous clause: kuka is used for persons in this case

sometimes in the locative cases even when referring to the previous word when used to signify location or direction (in free variation with joka)

what, which

what?

whatever

which, that, what

what

which, that, what

something, whatever

Synonym of milläin (what kind of, which)

Source: wiktionary.org