di·rec·tion·al

[dih-rek-shuh-nl, dahy-]
adjective
1.
of, pertaining 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, pertaining to, or providing guidance or leadership.

Origin:
1605–15; direction + -al1

di·rec·tion·al·i·ty, noun
di·rec·tion·al·ly, adverb
un·di·rec·tion·al, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To directional
Collins
World English Dictionary
directional (dɪˈrɛkʃənəl, daɪ-) [Click for IPA pronunciation guide]
 
adj
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
 
direction'ality
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
00:10
Directional is always a great word to know.
So is callithumpian. Does it mean:
a fool or simpleton; ninny.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Example sentences
Pointing to the cube and pressing up on the directional pad, an alert pops up
  telling him to check the cube.
But the simplest likely universal asymmetry seems to me to be directional
  rotation, or spin.
Yes, sure, a mobile phone with a directional antenna can connect to a base
  station outside the normal range.
Emma isn't any closer to being able to read the maps or the directional
  information, of course.
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