"pay one's formal respects" "formal dress" "a formal ball" "the requirement was only formal and often ignored" "a formal education"
"formal duties" "an official banquet"
"the paper was written in formal English"
"formal proof"
"a courtly gentleman"
Young ladies..wear short formals, and old ladies wear floor-length evening dresses.
She looked sufficiently virginal to be attending her first formal.
Deceit is the formal, constituent reason of hypocrisy.
牛津高階第八版
美國韋氏詞典
Dictionary.com
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維基百科 (自由的百科全書)