This is the 304th most frequent Finnish word.
seitsemän
The Finnish word "seitsemän" means "seven" in English.
In this sentence, 'seitsemän' refers to the specific time of seven o'clock, used with the case suffix '-ltä' to indicate 'at'.
He heräävät seitsemältä aamulla.
They wake up at seven in the morning.
Here, 'seitsemän' serves as a noun referring to the numeral seven itself, treated as a subject of the sentence.
Seitsemän on minun onnennumeroni.
Seven is my lucky number.
Here, 'seitsemän' is used to express the exact quantity of books.