joukkioon
Joukkioon is a Finnish illative form used to express movement into a crowd or into a group. The base noun is joukko, meaning crowd or group, and the illative marks direction or destination. In standard Finnish, the common illative singular of joukko is joukkoon, not joukkioon. Therefore joukkioon is typically regarded as nonstandard, dialectal, or historical. It may appear in older texts or in some regional varieties where phonological assimilation or spelling conventions favored -ioon/-oon variants. The meaning, when used, is the same as with joukkoon: into the crowd, into the group, or into a gathered audience.
Because Finnish grammar treats illative forms as a suffixal process, the presence of joukkioon points to a
In practice, most examples discussing entering a crowd would use joukkoon. For instance, a sentence describing