One of the mysteries of the English language finally explained.
That can be distinctly marked out or identified; distinguishable, discernible.
Capable of being designed, able to be designed.
Early 17th century; earliest use found in Thomas Jackson. From classical Latin dēsignāre + -ble; compare post-classical Latin designabilis that can be specified<br>late 19th century. From design + -able. Compare earlier designable.
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