middle

an area that is approximately central within some larger region

it is in the center of town

being neither at the beginning nor at the end in a series

adolescence is an awkward in between age

equally distant from the extremes

an intermediate part or section;, Aristotle

A whole is that which has beginning, middle, and end

the middle area of the human torso (usually in front)

young American women believe that a bare midriff is fashionable