Naapureidensa

Naapureidensa is a Finnish grammatical form used to express possession by a third-person plural, roughly translating to "their neighbors’" in English. It functions as a possessive modifier, indicating that the thing belongs to more than one neighbor.

Morphology and formation: the form is built from the noun naapuri (neighbor). In its plural genitive, it becomes naapureiden, and the third-person plural possessive suffix -nsä (or -sä, depending on vowel harmony) is appended, producing naapureidensa. This suffix placement means the entire phrase conveys ownership by a group of neighbors rather than by a single person.

Usage: naapureidensa is typically placed before the possessed noun. Examples include Naapureidensa auto (their neighbors’ car) and Naapureidensa talot (their neighbors’ houses). The construction can be extended to plural possessed nouns, as in Naapureidensa autoja (their neighbors’ cars) or Naapureidensa lapsia (their neighbors’ children), with the governing case marking of the possessed noun following Finnish grammar.

Notes: The form is standard in Finnish and relies on the regular pattern of genitive plural plus the third-person possessive suffix. Because Finnish possessive forms can be ambiguous without context, naapureidensa is usually clarified by accompanying sentence elements. It is commonly found in written Finnish, formal discourse, and everyday speech when specifying ownership by a group of neighbors.

See also: Finnish grammar, possessive suffixes, genitive.