Compound attributive adjective meaning 'of high importance' or 'requiring immediate attention'; typically used before a noun.
Translations
This is a high-priority issue for us.
Это для нас первостепенный вопрос.
The repair of the leaking pipe is a high-priority task.
Ремонт протекающей трубы — первоочередная задача.
Definitions
Of very great importance; needing to be dealt with before other things. The repair of the leaking pipe is a high-priority task.