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 in particular. …

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

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

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

7 meanings: 1. range of knowledge or perception (esp in the phrases beyond or in one's ken) 2. Scottish and Northern England.... Click for more definitions.

Dec 28, 2025 · In common usage a fossil word, found only in phrases such as beyond one’s ken and swim into one’s ken.

In Scots law, to acknowledge or recognize by a judicial act: as, to ken a widow to her terce (that is, to recognize or decree by a judicial act the right of a widow to the life-rent of her share of her deceased …

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 definition: Perception; understanding.

The noun ken means "range of vision or comprehension." If quantum mechanics is beyond your ken, you don't understand it, or it is beyond your scope of knowledge. Ken is rarely used today outside of …