Music: consisting of or based on chords. The pianist employed a chordal accompaniment to support the vocalist.
Geometry: relating to a chord, a straight line joining two points on a curve. The engineers computed the chordal length across the arch.
Anatomy: relating to the chordae tendineae of the heart valves or other fibrous cords. The surgeon repaired the ruptured chordal tissue in the mitral valve.
Graph theory: (of a graph) having no induced cycles of length greater than three. Chordal graphs allow several optimisation problems to be solved efficiently.