Several economists predicted the downturn, notably Dr. John Smith, who was among the first to warn of it.

notably 是形容词 notable 的副词形式，由词根 note（注意）和后缀 -able（能够...的）构成形容词，再加 -ly 变成副词。意思是"显著地、值得注意地"，用于强调后面提到的内容特别重要或突出。