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Wikipedia defines booster as"A booster rocket (or engine) is either the first stage of a multistage launch vehicle, or else a shorter-burning rocket used in parallel with longer-burning sustainer rockets to augment the space vehicle's takeoff thrust and payload capability."

Is this a case of Pedantics of the definition or are boosters always parallely staged?

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  • $\begingroup$ ...is either the first stage of a multistage launch vehicle, or else a .... $\endgroup$ – Organic Marble Feb 21 at 19:51
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The definition doesn't require staging in parallel. The booster is either the first of multiple stages, or one that drops off a sustainer stage that lit at sea level and keeps climbing post booster-shutdown. It's a rather open and flexible definition, rather than pedantic.

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