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Booster
/bˈuːstɐ/
/ˈbustɝ/
Booster
[NOUN]1
a rocket that gives a spacecraft or missile the extra power it needs to leave the Earth's atmosphere
2
an additional dose of vaccine required periodically in order to increase, maintain, or renew the effects of a previous one
3
an amplifier for restoring the strength of a transmitted signal