"Hereby order" is a phrase commonly used in legal and official documents to give clear instructions or commands. However, there are several alternative phrases that can be used interchangeably with this phrase to convey the same meaning. These include "direct", "command", "enjoin", "instruct", "mandate", "require", "ordain" and "prescribe". Using these synonyms can add variety and precision to legal documents while still maintaining the intended meaning. It's important to choose synonyms carefully, however; some words may hold different connotations and levels of formality, which may affect the tone or legal weight of the document.