strict order; your order
Formal, somewhat stiff term for a strict command or instruction, often from a superior. 'Your order' is a polite way to refer to someone else's directive.
We changed the plan in accordance with the president's strict order.
This is the department head's order, so please make sure to follow it.
Compound of 厳 (strict, stern) and 旨 (purport, gist). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning of a strict directive.