ken
n. uncountable C2 Proficiency US //ˈkɛn// UK //kˈɛn// ken
n. the limit of what you know or understand. If something is beyond your ken, it means you do not have the knowledge to explain it.
n. the range of perception, understanding, or knowledge. Often used in the fixed phrase 'beyond one's ken' to describe concepts that are intellectually inaccessible.
The complex math problem was beyond my ken.
The inner workings of the quantum computer were entirely beyond the ken of the average visitor.
While the physical laws of the universe are increasingly well-mapped, the subjective nature of consciousness remains largely beyond the ken of modern neuroscience.
Usage
Almost exclusively used in the singular and typically appears in the prepositional phrase 'beyond one's ken'.