principál
principal adjective [ always before noun ] uk/ˈprɪnsəpəl/ usB1 main, or most important
главный, основной
Her principal reason for moving is to be nearer her mother.
principal noun [ C ] uk/ˈprɪnsəpəl/ us
B2 the person in charge of a school or college
директор (школы, колледжа)
She was caught smoking and sent to see the principal .