ken sb. (1 Bourne, 1574, says that a ken is 6 or 9 leagues; Leland, 1538, has ‘a Kenning, that is to say about a xx miles,’ Botoner, 15th cent., ‘quilibet kennyng continet 21 miliaria’)
1.
the distance that
bounds the range of ordinary vision, esp. at sea;
about 20 miles
2H4 IV. i. 151
“within a ken our army
lies,”
Cym. III. vi. 6
“Thou wast with in a
ken.”
2.
sight or view (of a
place)
2H6 III. ii. 113
“losing of Albion's
wished coast,”
Lucr. 1114
“in of shore.”