zmieniajúcim
The word "zmieniajúcim" is the instrumental singular masculine or neuter form of the present active participle of the Czech verb "změnit," which means "to change." In Czech grammar, participles are verb forms that function as adjectives or adverbs, describing an action or state.
The instrumental case is used to indicate the instrument or means by which an action is performed.
For example, in a sentence, one might encounter "tím zmieniajúcim procesem" which translates to "by that changing