Русско-англо-русский юридический словарь

Alternate director. Someone appointed by an existing director, under a company's articles of association, to take their place temporarily at board meetings, or a specific board meeting, when the appointing director cannot attend. An alternate director is a director only temporarily, while acting as alternate. (Practical Law UK)

An alternate director can be given some or all of the powers as the appointing director. They can also have the same obligations as the appointing director. (asic.gov.au)