The ability to get a point across with words is not always an easy task.
Whether spoken or written, your aim is to re-create your idea, as near as possible, in someone else's mind.
You must choose your words and phrasing carefully so that at the end of the exercise, you and your audience understand each other.

Clarity
Pronunciation: 'kler-ə-tē Function: noun
- Etymology:
-
Middle English clarite, from Latin claritat-, claritas, from clarus
Date: 1616
Definition
: clearness or lucidity as to perception or understanding
: freedom from indistinctness or ambiguity
: state or quality of being clear to the eye
Syn: intelligibility, exactness, simplicity
(Source: Webster's New Universal Unabridged Dictionary)