This is the 248th most frequent Spanish word.
siete
The number "seven."
Here, 'siete' is used as a cardinal number to indicate a quantity.
Compré siete manzanas en el mercado.
I bought seven apples at the market.
In this sentence, 'siete' represents a specific time, namely 7:00 PM.
El programa empieza a las siete de la noche.
The program starts at seven in the evening.
'Siete' is used figuratively here to represent a medium score or average ability in cooking, on a scale often understood to be out of ten.