It usually happens once words have properly registered with the Bureau of Acceptable Phraseology found in the halls of the Lexicon. There are, of course, those words who have been duly elected by all the other words to act in an official manner in the governing of words and sentences and paragraphs. These officials do not necessarily make the word official in the sense that you mean, as there are many official words who've never been elected to office. The Lexicon, being a lexicon of the words, by the words and for the words has legislated laws, codes and grammatical rules that govern words. These laws of language are upheld and enforced and brought to justice by Lexicon officials, but every word knows that Official, being an official word, has never been, nor is it likely Official ever will be an elected or appointed official of the Lexicon. Official is an anarchist, which is ironic because Anarchy is currently the duly elected President of the United Pages of Volume IV. Just goes to show you cant judge a book by it's cover or a word by its letters.
unofficial
Unofficial
there isn't a root word for it
The way I see it there are two types of dating. Unofficial, and official. Unofficial is susceptible to change without notice. I recommend that you make sure it's official. Simply call him your boyfriend. If he agrees that makes it official. Or even just ask him!
The Official Unofficial BABYS Album was created in 2006.
official
Official: She left to pursue other opportunities. Unofficial: They canned her.
Tennesee has no official or unofficial deserts.
There really is not much of a difference between unofficial and non-official. They both mean non confirmed and non formal.
A shamrock is often used as an unofficial symbol for Ireland. The official symbol is a harp.
This is just an unofficial estimate.
There are a few official sites and many unofficial sites. The two official sites are linked to this question, for the unofficial sites it is best to search for them as they can change or vanish.