Etymology

Noun

1. authorisation; consent (especially formal consent from someone in authority)

   Sire, do I have your permission to execute this traitor?

2. The act of permitting

   Do I have your permission to throw this away?

3. flags or access control lists pertaining to a file that dictate who can access it, and how.

   I used the command "chmod 644 /var/www/html/index.htm" to change the file's permission.