This is the 489th most frequent Icelandic word.
stærð
Size; magnitude; scale.
The word "stærð" is used to denote the physical dimensions or scale of the country in this context.
Stærð landsins er ótrúlega mikil.
The size of the country is incredibly large.
In this sentence, "stærð" refers to a clothing size measurement.
Hún valdi stærð M fyrir jakkann sinn.
She chose size M for her jacket.
Here, "stærð" is used abstractly to imply the magnitude or scale of importance in a conceptual sense.