yleisimmä

Yleisimmä is not an independent word in Finnish but a morphological stem form related to the adjective yleinen ("common"). It represents the superlative stem of that adjective (from superlative yleisin, "most common") and appears when the superlative is inflected with case endings or combined with other suffixes. Linguistically it is often written with a hyphen as yleisimmä- to mark that it is a bound stem rather than a standalone lexeme.

The form appears in inflected variants such as yleisimmän (genitive singular, "of the most common"), yleisimmässä (inessive, "in the most common"), and yleisimmistä (elative or partitive plural contexts, "from/of the most common"). It is used whenever the superlative requires further morphological marking: for example, yleisimmät oireet ("the most common symptoms") or yksi yleisimmistä syistä ("one of the most common causes").

Etymologically it derives from the adjective yleinen with the comparative/superlative morphology of Finnish; the superlative stem incorporates the characteristic -immā- element that appears in inflected superlatives. In dictionaries and grammatical descriptions such stems are presented to show how adjectives are combined with case endings. Users encountering yleisimmä outside a sentence should understand it as a piece of inflected morphology rather than a full lexical item. Related forms include yleisin (superlative base), yleisempi (comparative), and yleinen (positive).