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 Ò€¦ Definition of ken noun in oxford advanced learner's dictionary.

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. Not in your area of knowledge: To know someone or something 3. Not in your area ofÒ€¦. Learn more. Knowledge, understanding, or cognizance; Mental perception.

Learn more. Knowledge, understanding, or cognizance; Mental perception. See examples of ken used in a sentence.