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Pronunciation varies by accent · noun
(physics) A four-vector that describes the change in a particle's four-velocity over time.
Use four-acceleration when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Four-acceleration means (physics) A four-vector that describes the change in a particle's four-velocity over time.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use four-acceleration where its definition matches the intended context.
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