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Is the plural for changes in velocity delta velocity's or deltas velocity? Basis for confusion:attorneys general. Each stage in a rocket has a set amount of delta velocity, or the amount the velocity can change over any amount of time. If I want to get the delta velocity for the first stage and the 3rd but not the second what plural form do I use.

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It would be 'delta velocities'.

Nouns are pluralised — modifiers aren't. An attorney general is a type of attorney (hence 'attorneys general'), and a delta velocity is (sort of) a type of velocity, so 'delta velocities' it is.

As an aside, I've heard 'delta' used as a noun often enough that 'velocity delta' and 'velocity deltas' sounds fine to me too. I prefer 'delta velocities', I think, but depending on context something like 'changes in velocity' or 'accelerations' might be more readable.

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  • I would actually prefer velocity deltas. It emphasises that these are multiple measurements of change. But +1
    – itsbruce
    Nov 30, 2014 at 10:50
  • i agree with this one. a delta velocity isn't a type velocity. in maths delta means change. as you derive you keep measuring different changes. delta distance over a set amount of time is velocity. delta velocity over a specific time is acceleration but in rocketry the set amount of time can change drastically. Nov 30, 2014 at 15:34

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