granular in relation to permissions, authorization and security means many levels of permissions; ability to restrict specific actions while permitting others.
In low-granularity systems, users may be given permissions of read/write, read and no access. The file will be given three sets of permissions: for owner of the file, for users of group owning the file, and for all other users.
In fine-grained system you'll see permissions to create files, delete files, rename files, modify content, append to file, read file list, read file content, change file permissions, change file ownership, execute file as a program/script, copy file, override timestamps, create links, and so on, and so on. Specific sets of permissions can be assigned to specific users, terminals, access media, hours, groups, network interfaces used to access, etc.
For example, the administrator of a secure system may be allowed to create backups (copy) files between secure filesystems, but not read (view) their content. This requires a high granularity of permissions, as in most filesystems ability to read file is synonymous with ability to make copies.
Orenda
The force of human will, in opposition to fate or destiny, to affect the world.
http://dictionary.reference.com/browse/orenda
a supernatural force believed by the Iroquois Indians to be present, in varying degrees, in all objects or persons, and to be the spiritual force by which human accomplishment is attained or accounted for.
http://www.merriam-webster.com/dictionary/orenda
extraordinary invisible power believed by the Iroquois Indians to pervade in varying degrees all animate and inanimate natural objects as a transmissible spiritual energy capable of being exerted according to the will of its possessor
http://www.urbandictionary.com/define.php?term=orenda
a supernatural, divine force within every human being. Always omnipresent.
It empowers people to change the world in a positive, loving way.
It is the energy that effects change in One's own life.
"That inspirational speaker lifted me up so much with her 'orenda'. She made me feel that energy within myself to change the world for the better, through changing myself."
http://io9.com/5905257/10-untranslatable-words-and-when-youll-want-to-use-them
the invocation of the power of human will to change the world around us. It is set up to be the opposing force to fate or destiny. If powerful forces beyond your control are trying to force you one way, orenda is a kind of voiced summoning of personal strength to change fate.
http://www.oxforddictionaries.com/definition/english/orenda
invisible magic power believed by the Iroquois to pervade all natural objects as a spiritual energy.
Also see Google results for "orenda definition"
Best Answer
I wouldn't consider you to be wrong (a Mac is a personal computer), but it is definitely the case that some people might be confused by using the terms in that way and it would then require further explanation. Because of that, I'm not sure there's really a definite answer to this as it will depend on the context and the knowledge of the reader. If in doubt, go for whatever phrasing is least likely to cause confusion.
I believe the term "PC" became the generally used expression as it stemmed from "IBM-compatible PC", which gradually became more and more mainstream. However you could also argue (correctly) that a modern Mac is also an IBM-compatible PC, since they use the same CPU architecture and so on now - just to add another level of confusion ;)