árum

In a sentence

• Við höfum ekki sést í mörgum árum.

  We haven't seen each other in many years.

  The word 'árum' is the dative plural form of 'ár' (years), used here to indicate a time frame in which the action did not occur.

• Saga þjóðarinnar teygir sig aftur í margar aldir, en þessi nýjung hófst fyrir fáum árum.

  The history of the nation stretches back centuries, but this innovation started a few years ago.

  'Árum' is used in its dative plural form to specify the point in time relative to an event occurring in the past.

• Árum seinna komst hann að, hversu mikil áhrif þessi ákvörðun hefði haft.

  Years later, he realized the impact that decision had.

  'Árum' functions as an adverbial dative plural noun to express a chronological reference to a later period in time.