This is the 771st most frequent Lithuanian word.
ketverius
"Ketverius" means "four (accusative plural, used with time periods or sets)" in English.
Here, 'ketverius' is used to indicate a period of four years in the accusative case, specifying a duration.
Aš buvau ten ketverius metus.
I was there for four years.
In this sentence, 'ketverius' describes a specific quantity of shoes, reflecting a plural object in the accusative case.
Jis nusipirko ketverius batus.
He bought four shoes.
The word 'ketverius' here is used to denote a time span of four months, showing its use for durations.