This is the 227th most frequent Lithuanian word.
mokslo
The Lithuanian word "mokslo" means "of science" or "of learning."
The word 'mokslo' is in the genitive case, denoting possession or relation, describing that the progress ('pažanga') is of science.
Mokslo pažanga lemia geresnį visuomenės gyvenimą.
The progress of science leads to a better society's life.
Here, 'mokslo' in 'Mokslo dieną' is part of a fixed expression used to signify the day dedicated to science or education, again in genitive case.
Mokslo dieną mokiniai pradeda su didele švente.
On the science day, students start with a big celebration.
In this sentence, 'mokslo' modifies 'žinių' (knowledge), emphasizing the type of knowledge required, using the genitive case for specification.