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Which one is correct?

  1. He has a dual nationality.
  2. He has dual nationality.
  3. He has dual nationalities.
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I used have dual citizenship. Extrapolate as you feel fit. :-) – jyc23 Jun 14 '11 at 4:11
The vast majority of Americans (for instance) have dual nationality. Unless you are referring to ethnicity, dual citizenship is probably more appropriate, and less ambiguous. – horatio Jun 14 '11 at 16:24
@horatio: How is nationality different from citizenship? Is the first one just not official or not recognized by a government? – Mitch Jun 14 '11 at 19:25
Note that I said "nationality" is often ambiguous, but not wrong. It is common at some point for someone to enquire as to one's nationality. For example, by parents are by turns Irish, English, and German. I have friends who claim to be of 5 or six different nationalities. So in my personal experience, nationality does not always mean citizenship. – horatio Jun 14 '11 at 19:34
up vote 3 down vote accepted

My vote is for "He has dual nationality." This construction treats "dual nationality" as a legal status unto itself, not as countable item(s).

The Google test agrees with this, returning 9,000, 68,000, and 3,000 results for your three respective options.

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Did you google the sentence using "He has"? – Louis Rhys Jun 14 '11 at 5:04

I would say it was "dual nationality", cause although he has two types of nationality, he has one actual nationality, that is a mix of the two.

This can also be seen in things like "the dual number.", which is a number composed of two other numbers.

share|improve this answer
I think you will find dual number more commonly refer to en.wikipedia.org/wiki/Dual_%28grammatical_number%29, than to mathworld.wolfram.com/DualNumber.html, thought I agree - plural would refer to multiple things that can be called dual. – Unreason Jun 14 '11 at 7:56

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