/
ˌrɛktɪˈlɪnɪə/
adj.
  - contained by, consisting of, or moving in a straight line or lines.
 - Photography  (of a wide-angle lens) corrected so that straight lines in the subject appear straight in the image.
 
Derivative
- rectilinearity n.
  - rectilinearly adv.
 
Etymology
C17: from late L. rectilineus (from L. rectus ‘straight’ + linea ‘line’) + -ar1.