di ‧ rec ‧ tion ‧ al /dəˈrekʃ ə nəl, dɪˈrekʃ ə nəl, daɪ-/ BrE AmE adjective technical
1 . relating to the direction in which something is pointing or moving
2 . a directional piece of equipment receives or gives out radio signals from some directions more strongly than others