Prostedím
Prostedím is the non-diacritic variant often encountered as a representation of the Czech instrumental singular form prostředím, which is derived from the neuter noun prostředí. The standard orthography uses prostředím with the diacritic on ř; prostedím appears mainly in plain ASCII texts or older materials where diacritics are omitted. As a result, prostedím or prostedím is not regarded as a separate dictionary entry, but as a variant spelling of the same form.
Prostředí, meaning environment, milieu, or surrounding conditions, denotes the physical, social, or cultural setting in which
Grammatical notes: prostředí is a neuter noun. Its instrumental singular form is prostředím, while other cases
In summary, prostedím is not a separate lexical item but a non-diacritic rendering of the Czech instrumental