The Art of Leadership

The Greek word "kethale" refers most often to
the coping of a wall or head or mouth of a river,
denoting the idea of "source" and "origin."

In the LXX the word refers to the head of a human being
(Gen 28:18; Exod 29:7), an animal (Gen 3:15; Exod 29:19),
a tribe (Exod 6:14; Judg 11:8), or tower (Gen: 11:4).

When it is used metaphorically of a person, it means
"ruler, person of superior authority or rank."

It also inherently conveys the idea of leadership or authority,
and denotes preeminence or prominence.

Certainly, when "kethale" is used in relationship to Christ,
it refers to His authority over the church (Eph 1:22, 5:23; Col 1:18)


Source: Hoehner, Harold W.: Ephesians: An Exegetical Commentary