imperial visit; visit by the empress or crown prince
Formal, respectful term used in official or historical contexts for a visit by the empress or crown prince. Not used for ordinary visits.
The ceremony was held with the gracious attendance of Her Majesty the Empress.
The commemorative ceremony was held in the presence of His Imperial Highness the Crown Prince.
台 (elevated platform, honorific prefix) + 臨 (to attend, to visit). The exact historical derivation is uncertain, but the kanji combination conveys a respectful visit by a high-ranking imperial personage.