This is the 709th most frequent Lithuanian word.
kelios
"Kelios" means "several" or "a few" in English.
Here, 'kelios' functions as a quantifier meaning 'a few' or 'several', indicating an approximate quantity of 'dienos' (days).
Kelios dienos praėjo nuo paskutinio susitikimo.
A few days have passed since the last meeting.
In this sentence, 'kelios' also acts as a quantifier ('a few' or 'some') describing the noun 'lentynų' (shelves), again suggesting an unspecified number.
Knygos buvo numestos ant kelių lentynų.
The books were placed on a few shelves.
Here, 'kelias' is a form of 'kelios' used with the feminine noun 'valandas' (hours), to indicate an approximate duration of time.