I am inviting my girlfriend to come to canada and i will provide an invitation letter. should i address her as my "special friend" or "girlfriend" or conjugal partner?
Lol.. Special Friend doesnt work. Mention her as a girl friend or fiancee (if you guys are engaged or planning to get engaged). You should be able to prove your case also that she will be in canada for Visiting purpose only and she has strong ties with her country of residence.
Being perfectly honest is what i recommend.
Honesty is the best policy...especially when it comes to immigration stuff. anything suspicious, they WILL definately investigate which will cause delay.
As long as she has strong ties in the country of origin and all the necessary documents are provided to the best of your knowledge, you'll have a good chance of getting her approved.