Latin: friend of the court. Refers more specifically to persons asking for permission to intervene in a case in which they are neither plaintiff or defendant, usually to present their point of view (or that of their organization) in a case which has the potential of setting a legal precedent in their area of activity. This is common, for example, in civil rights cases and, in some instances, can only be done with the permission of the parties or the court.
AMICUS CURIAE
Meaning of AMICUS CURIAE in English
Duhaime's Law English dictionary. Английский юридический словарь Duhaime . 2012