marginaaliseen
Marginaaliseen is the illative singular form of the Finnish adjective marginaalinen, meaning marginal. In Finnish, adjectives decline and take case endings to match the nouns they modify. Marginaaliseen is used when the modified noun is in the illative case, which expresses movement into or toward something, roughly translating to “into a marginal …” in English.
As a grammatical form, marginaaliseen does not stand alone as a separate word with its own meaning;
The base adjective marginaalinen, from which marginaaliseen is derived, means marginal or marginalised and is used
In summary, marginaaliseen is a grammatical form rather than a standalone lexical item, representing the illative