プログレッシブ和英中辞典(第4版)の解説
せいだい【盛大】
grandeur; magnificence
盛大な（に） grand(ly); magnificent(ly)
盛大な結婚式
a magnificent wedding ceremony
開会式は盛大に行われた
The opening ceremony 「was a grand event [was held on a grand scale].
彼は盛大な歓迎を受けた
He was received with great enthusiasm.／He received a lavish welcome.
盛大な見送りを受けた
We were given a big send-off.／A large group of people came to see us off.