形容詞 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
   同義詞：directing, directive, guiding

1. A radio receiver and directional antenna used as a system to determine the angular direction of incoming radio signals.
   無線方向探測器一種無線電接收和指向天線系統(tǒng)，用來確定收到的無線電信號的角方向
2. Something, such as a directional symbol, that is similar to an arrow in form or function.
   箭頭形符號功能或形式類似箭頭的某物，如用于指示方向的符號
3. Having no particular directional characteristics.
   無定向的具有無特定方向的特征

di.rec.tion.al

adj.（形容詞）
Of or indicating direction:
方向的：方向的或指示方向的：
例句：
an automobile`s directional lights.
汽車方向指示燈

Electronics Capable of receiving or sending signals in one direction only.
【電子學(xué)】 定向的：只能從一個方向接收或發(fā)射信號的
Relating to guidance in effort, behavior, or thought:
指導(dǎo)性的：關(guān)于努力、行為或思考方面的指導(dǎo)的：
例句：
directional training.
指導(dǎo)性的訓(xùn)練

Serving to point the future direction, as of fashion:
發(fā)展趨勢的：用以指示將來發(fā)展方向的，如時尚的：
例句：
.A directional group of sweater knit colors are winter pastels.(Women`s Wear Daily)
.一組針織套衫顏色的流行趨勢是冬天的柔和色.(婦女時裝日報)

n.（名詞）
A directional signal.
轉(zhuǎn)彎燈

【引伸】
direc.tional.ity