noun
initiative; pioneering; taking the lead
Often used in the phrase 先鞭をつける (to take the initiative, to be the first to do something). Conveys a sense of being ahead of others in a field or endeavor.
彼はこの分野の研究に先鞭をつけた。
He pioneered research in this field.
新技術の開発で先鞭を取る
More companies are taking the lead in developing new technologies.
先駆け also means pioneering or being a forerunner, but it is more commonly used for people or things that appear first, while 先鞭 emphasizes the act of taking initiative or setting a precedent.
先手 means 'moving first' or 'taking the initiative' in a competitive or strategic context (e.g., games, business), whereas 先鞭 is broader and often used for intellectual or creative firsts.
From Chinese 先鞭 (xiānbiān), literally 'first whip', meaning to be the first to spur one's horse forward, hence to take the lead. The Japanese reading せんべん is the on'yomi of the characters.