This is the 587th most frequent Lithuanian word.
pirmadienį
"On Monday."
The word 'pirmadienį' is used as an adverb to indicate the specific day, translating to 'on Monday'.
Aš lankiausi bibliotekoje pirmadienį.
I visited the library on Monday.
'Pirmadienį' here acts similarly as a temporal adverb specifying 'on Monday' when the event occurred.
Pirmadienį mokykloje vyko šventė.
There was a celebration at school on Monday.
In this sentence, 'pirmadienį' refers to a future occurrence, denoting 'Next Monday' with the adjective 'Kitą' providing added specificity.