Ken appeared on the English horizon in the 16th century referring to the distance bounding the range of ordinary vision at sea (about 20 miles), and would thus have been familiar to skippers …

KEN meaning: not within the range of what someone knows or understands

KEN definition: 1. not in your area of knowledge: 2. to know someone or something 3. not in your area of…. Learn more.

1. knowledge or understanding: an idea beyond one's ken. 2. range of sight or vision.

There are six meanings listed in OED's entry for the noun ken, two of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

Ken in American English (ken) noun a male given name, form of Kendall or Kenneth

KEN definition: knowledge, understanding, or cognizance; mental perception. See examples of ken used in a sentence.

In this context, the phrase is infelicitous : ' beyond one's ken ', in its ordinary usage, means beyond one's powers of comprehension.

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Ken (ken), n. a male given name, form of Kendall or Kenneth. Ken., Place Names Kentucky.