English crucial

← English crux (mention)

← French crucial (borrowed)

← Proto-Indo-European *(s)ker- (turn) (root)

← Proto-Indo-European *(s)ker- (derived)

← Latin crux (mention)

→ English light (link)

→ English crucially (suffix)

→ English noncrucial (prefix)

→ English cruciality (suffix)

→ English crucialness (suffix)

→ Spanish crucial (borrowed)

→ Dutch cruciaal (borrowed)