defect1
  
  n.
  
/
ˈdiːfɛkt, 
dɪˈfɛkt/
 a shortcoming, imperfection, or lack.
 
  Etymology
  ME: from L. defectus, past part. of deficere ‘desert or fail’, from de- (expressing reversal) + facere ‘do’.
 defect2
 
/
dɪˈfɛkt/
v.
 abandon one's country or cause in favour of an opposing one.
Derivative
Etymology
C16: from L. defect-, deficere (see defect1).