[dih-rek-shuh-nl, dahy-]
of, pertaining to, or indicating direction in space.
Radio. adapted for determining the direction of signals received, or for transmitting signals in a given direction: a directional antenna.
of, pertaining to, or providing guidance or leadership.

1605–15; direction + -al1

directionality, noun
directionally, adverb
undirectional, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
directional (dɪˈrɛkʃənəl, daɪ-)
1.  of or relating to a spatial direction
2.  electronics
 a.  having or relating to an increased sensitivity to radio waves, sound waves, nuclear particles, etc, coming from a particular direction
 b.  (of an aerial) transmitting or receiving radio waves more effectively in some directions than in others
3.  physics, electronics
 a.  concentrated in, following, or producing motion in a particular direction
 b.  indicating direction
4.  indicating the direction something, such as a fashion trend, might take: directional fashion looks

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Nevertheless, the theory has a directional bias that explains how inequalities
  can be generated, but not how they can be undone.
The family in the darkness in their fixed tableau watched one another by the
  light of a directional signal, endlessly blinking.
As much as possible, physical and virtual spaces have been developed to
  minimize the need to answer simple directional questions.
Visual cues, including directional arrows, indicate where the misfiled book
  ought to go.
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