päättääkseen

Päättääkseen is a Finnish non-finite verb form derived from the verb päättää ("to decide", "to conclude"). It is built from the verb stem with the purpose-forming element -kse- plus a personal ending, and is commonly translated as "in order to decide" or "so that he/she/it may decide".

Grammatically, päättääkseen belongs to a class of infinitival constructions used to express purpose, intention or reason. It often appears in subordinate clauses where the action in the infinitive is motivated by or intended to bring about the action of the main clause. The form typically refers to a third-person or non-first-person subject when the subject of the infinitive differs from the main clause, though context determines reference.

Usage of päättääkseen is frequent in written and formal Finnish; it can be replaced by a finite clause introduced by jotta or niin että in more explicit or colloquial expression (for example, "jotta hän voi päättää"). Examples: "Hän kokoontui ryhmän kanssa päättääkseen projektin tavoitteista" (He met with the group in order to decide the project's objectives).

Related forms include other verbs with the -kse- + personal ending pattern, such as tullakseen and ymmärtääkseen. The construction is a compact way in Finnish to encode purpose combined with a specific subject reference.