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especially : one of two or more rows, levels, or ranks arranged one above another
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Seems to support my definition of tier as far as the game is concerned.
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I'd like to point out that the definition as stated supports both structures, neither more than the other
Hover
Air Superiority
Fly
Group Fly
just as much as your
Hover
Air Superiority
Fly
Group Fly
I don't use the "tier" system when I'm discussing powers for the exact reason stated earlier, people use it differently, just pointing that out.
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One of two or more rows, like..?
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My 2 cents:
I think the definition is actually pretty clear.
A. There needs to be more than one of whaterver it is you are calling a tier.
B. And each one is a tier. Again, it says [u]One[u] of two or more, not two of two or more, not one or two of two or more. Just one.
1. Hover
2. Air Superiority
3. Flight
4. Group Flight
Which means - to put it succintly - that for the 60mnth vet reward you can claim your travel power - which is tier 3 - at lvl 6 instead of waiting until you are lvl 14 and you don't have to have tier one or tier two in order to do so. 
There is always a lot to be thankful for, if you take the time to look. For example, I'm sitting here thinking how nice it is that wrinkles don't hurt. ~Author Unknown
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It's not like I've been agreeing with the Devs much lately (stupid badge deletions).
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There I am in agreement. Some of the badges they're removing from MA don't really need to be removed.