What does 当～ mean?
当～ is a Japanese noun meaning “Our ~ (e.g., Hotel, plane, etc.)” in English. It is written as 当～ in kanji, とう～ in hiragana, and tou～ in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
本当にお久しぶりです。
It's been a long time.