imperial command; royal command
Refers to an order or decree issued by an emperor or monarch. Formal and historical in tone; not used for ordinary commands.
天皇の大命により、新しい法律が公布された。
A new law was promulgated by imperial command.
Compound of 大 (great) and 命 (command, decree). The exact historical derivation is uncertain, but the term has been used in classical and formal contexts to refer to commands from the highest authority.