Is the word "illusionary" proper for real English?
Hello everybody!
I heard yesterday a song which has such words “illusionary dreams”.
In principle I understand the meaning of “illusionary” but I'm concerned about an absence of this word in my 4 e-dictionaries. They have only 2 adjectives of “illusion” - “illusory” and “illusive”.
I have these questions then:
- Is the word “illusionary” proper in English?
- If it is, is it spread in English?
- What words are more appropriate for native speakers – “illusionary”, “illusive” or “illusory”?
- How do the native speakers usually pronounce the word “illusory” – (ilu:Zori OR ilu:Sori)?
Thanks a lot in advance.

Question

Is the word "illusionary" proper for real English?
Hello everybody!
I heard yesterday a song which has such  words “illusionary dreams”.
In principle I understand the meaning of “illusionary” but I'm concerned about an absence of this word in my 4 e-dictionaries. They have only 2 adjectives of “illusion” -  “illusory” and “illusive”.
I have these questions then:
- Is the word “illusionary” proper in English? 
- If it is, is it spread in English? 
- What words are more appropriate for native speakers – “illusionary”, “illusive” or “illusory”?
- How do the native speakers usually pronounce the word “illusory” – (ilu:Zori   OR  ilu:Sori)? 
Thanks a lot in advance.

Answer

Ivy has answered the first part of your question.
 It depends on the context as to how these 3 words are used. The pronunciation is illusory, but this may differ depending on the person's accent.

Answer

Oxford Advance dictionary tell us:
illusive (adj.) : based on illusion; deceptive
illusory (adj.) : based on illusion; deceptive
that means: illusive = illusory

illusionary(adj.) = illusional  (adj.) an illusion