crucially

Crucially is an English adverb that signals that a statement or fact is of central importance, or that a factor is decisive in a situation. It is used to draw attention to a point that is essential to understanding, a result, or a conclusion. In discourse, it often introduces a pivotal element or turning point.

It derives from the adjective crucial, which itself comes from Medieval Latin crucialis and French cruciale, ultimately from Latin crux “cross.” The adverbial form crucially was established in the early modern period and is commonly used across formal and informal registers.

Crucially, the word emphasizes significance rather than mere occurrence. It can precede a clause or follow a subject: “Crucially, the data show…” or “The data, crucially, indicate…” It is best used when highlighting a key factor that differentiates a finding or argument; overuse can appear performative.

See also: crucial, cruciality, importantly.