this is what they say on etymoline.com:
"late 14c., auctorisen, autorisen, "give formal approval or sanction to," also "confirm as authentic or true; regard (a book) as correct or trustworthy," from Old French autoriser, auctoriser "authorize, give authority to" (12c.) and directly from Medieval Latin auctorizare, from auctor (see author (n.))."
Mustapha Allamii
Hi there
The first one is correct: un as the prefix + author as the root + ize as the suffix.
The root is the noun 'author'. The derivational process is as follows: First the suffix 'ize' is attached, yielding the verb 'authorize'. The next step is the attachment of the prefix 'un', which does not change the word class.
That is the way. The first step is the addition of the suffix -ize, which is used to create verbs from adjectives, to the root 'author' (in its adjectival meaning) creating the verb digitalized with the meaning of 'making something A ('author')'. After this, we add negative preffix 'un', which means 'the opposite or contrary action of V', creating 'unauthorize'. The same evolution follows the chain: digital>digitalize>undigitalize.
As Christoph and Íker have written, the pathway for this derivation is:
[ un- [ [ author ]N -ize ]V ]V
It is debatable, however, if the derivation of [[ author ]N -ize]V can really be attributed to an active English process, since the word appears to have been borrowed wholesale, such that [ un- [ authorize ]V ]V may really be all that is warranted historically for English.
That is the way. The first step is the addition of the suffix -ize, which is used to create verbs from adjectives, to the root 'author' (in its adjectival or noun meaning) creating the verb authorized with the meaning of 'making something A or N ('author')'. After this, we add negative preffix 'un-', which means 'the opposite or contrary action of V', creating 'unauthorize'. The same evolution follows the chain: digital>digitalize>undigitalize. The final division is (un((author)N ize)V)