Rinjikyu was provisional payment of extra nenkan (a regular nenkan means: a right granted as a stipend to members of the Imperial Family [including the emperor], consorts of the emperor, some court nobles, and so forth to nominate a person for a certain government post conferred to them on the occasion of the annual installation of them as government officials).
臨時給（りんじきゅう）とは、規定外の年官を臨時に給与すること。