Akademik

burnup
noun
1. a high-speed motorcycle race on a public road
Usage Domain:
slang, ↑cant, ↑jargon, ↑lingo, ↑argot, ↑patois, ↑vernacular
Regions: ↑United Kingdom, ↑UK, ↑U.K., ↑Britain, ↑United Kingdom of Great Britain and Northern Ireland, ↑Great Britain
Hypernyms: ↑race
2. the amount of fuel used up (as in a nuclear reactor)
Hypernyms: ↑consumption, ↑using up, ↑expenditure

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\\ˈ ̷ ̷ˌ ̷ ̷\ noun (-s)
Etymology: from burn up, v.
1. : the amount of fuel destroyed (as in a nuclear reactor)

uranium burnup

a fuel burnup of five percent — Richard Stephenson

2. : the heating and vaporization of a rocket or satellite due to air resistance

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/berrn"up'/, n.
the nuclear fuel consumed in a reactor, often measured as a percentage of the atoms of fuel that have undergone fission.
[n. use of the v. phrase burn up]

Useful english dictionary. 2012.