Directional

[dɪ'rekʃ(ə)n(ə)l;daɪ-] or [də'rɛkʃənl]

(adj.) relating to or indicating directions in space; 'a directional microphone' .

(adj.) relating to direction toward a (nonspatial) goal; 'he tried to explain the directional trends of modern science' .

格特鲁德編輯--From WordNet