This is the 531st most frequent Icelandic word.
fjórða
"Fjórða" means "fourth" in English.
'Fjórða' is used as an ordinal numeral describing the noun 'sinn', indicating the sequence of occurrences.
Hann spilaði sinfóníuna sína í fjórða sinn á tónleikunum.
He played his symphony for the fourth time at the concert.
'Fjórða' serves as an ordinal numeral, modifying the masculine singular noun 'sigurinn' in accusative case.
Við fengum fjórða sigurinn okkar í keppninni.
We received our fourth victory in the competition.
'Fjórðu' functions as an ordinal numeral here and agrees in case, gender, and number with the feminine singular noun 'bókin'.