directional

形容词 directional:

1. relating to or indicating directions in space
2. relating to direction toward a (nonspatial) goal
3. showing the way by conducting or leading; imposing direction on
   同义词：directing, directive, guiding

1. A radio receiver and directional antenna used as a system to determine the angular direction of incoming radio signals.
   无线方向探测器一种无线电接收和指向天线系统，用来确定收到的无线电信号的角方向
2. Something, such as a directional symbol, that is similar to an arrow in form or function.
   箭头形符号功能或形式类似箭头的某物，如用于指示方向的符号
3. Having no particular directional characteristics.
   无定向的具有无特定方向的特征

di.rec.tion.al

adj.（形容词）
Of or indicating direction:
方向的：方向的或指示方向的：
例句：
an automobile`s directional lights.
汽车方向指示灯

Electronics Capable of receiving or sending signals in one direction only.
【电子学】 定向的：只能从一个方向接收或发射信号的
Relating to guidance in effort, behavior, or thought:
指导性的：关于努力、行为或思考方面的指导的：
例句：
directional training.
指导性的训练

Serving to point the future direction, as of fashion:
发展趋势的：用以指示将来发展方向的，如时尚的：
例句：
.A directional group of sweater knit colors are winter pastels.(Women`s Wear Daily)
.一组针织套衫颜色的流行趋势是冬天的柔和色.(妇女时装日报)

n.（名词）
A directional signal.
转弯灯

【引伸】
direc.tional.ity