'directionality' definitions:

Definition of 'directionality'

From: WordNet
noun
The property of a microphone or antenna of being more sensitive in one direction than in another; "the antenna received signals with no directivity" [syn: directivity, directionality]
noun
The property of being directional or maintaining a direction; "the directionality of written English is from left to right"

Definition of 'directionality'

From: GCIDE
  • directionality \directionality\ n. the property of a microphone or antenna of being more sensitive to signal arriving from one direction than from another.
  • Syn: directivity. [WordNet 1.5]