ax·is 
/ˈæksəs/ noun
plural ax·es /ˈæksəs/ noun /ˈækˌsi:z/ [count] 1 : the imaginary straight line that something (such as the Earth) turns around
▪ the Earth's axis of rotation ▪ the spin of the Earth on its axis 2 : a straight line that divides a shape evenly into two parts —called also axis of symmetry
▪ the Earth's axis of rotation ▪ the spin of the Earth on its axis
