n.
 permission for something to happen or be done.
v.
 
(
often consent to)
 give permission. 
▸agree to do something.
 
  Phrase
  
    
      - informed consent
 permission granted in the knowledge of the possible consequences. 
    
   
  Etymology
  ME: from OFr. consente (n.), consentir (v.), from L. consentire, from con- ‘together’ + sentire ‘feel’.