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directional

[dih-rek-shuh-nl, dahy-] /dɪˈrɛk ʃə nl, daɪ-/
adjective
1.
of, relating to, or indicating direction in space.
2.
Radio. adapted for determining the direction of signals received, or for transmitting signals in a given direction:
a directional antenna.
3.
of, relating to, or providing guidance or leadership.
Origin of directional
1605-1615
First recorded in 1605-15; direction + -al1
Related forms
directionality, noun
directionally, adverb
undirectional, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for undirectional

directional

/dɪˈrɛkʃənəl; daɪ-/
adjective
1.
of or relating to a spatial direction
2.
(electronics)
  1. having or relating to an increased sensitivity to radio waves, sound waves, nuclear particles, etc, coming from a particular direction
  2. (of an aerial) transmitting or receiving radio waves more effectively in some directions than in others
3.
(physics, electronics)
  1. concentrated in, following, or producing motion in a particular direction
  2. indicating direction
4.
indicating the direction something, such as a fashion trend, might take: directional fashion looks
Derived Forms
directionality, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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