Perspicuous
Perspicuous , adjective
[Latin perspicuus, from perspicere to look through. See Perspective.]
1.
Capable of being through; transparent; translucent; not opaque. [Obsolete] — Peacham
2.
Clear to the understanding; capable of being clearly understood; clear in thought or in expression; not obscure or ambiguous; as, a perspicuous writer; perspicuous statements.
The purpose is perspicuous.