Yeah, I found that definition, too. It seems you left out a word to prove your point, though.
im·mi·grant
[im-i-gruhnt] Show IPA
noun
1.
a person who migrates to another country, usually for permanent residence.
2.
an organism found in a new habitat.
adjective
3.
of or pertaining to immigrants and immigration: a department for immigrant affairs.
4.
immigrating.
I went ahead and copied the whole thing, so there wont be any confusion.
http://lmgtfy.com/?q=Immigrant+definition+#seen
Yea... I left no words out, I picked the first definition result. You are correct though, there are discrepancies between definitions.
Edit: I should have said Webster's defines immigrant as...
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