Annual Fuel Requirement, typically used in aviation and energy contexts to describe yearly fuel consumption needs.
Acronym formed from Annual Fuel Requirement in mid-20th century aviation industry. Each component derives from Latin: 'annual' from 'annus' (year), 'fuel' from Old French 'fouaille' (firewood), and 'requirement' from Latin 'requirere' (to seek).
AFR calculations are crucial for everything from airline route planning to spacecraft missions. NASA uses AFR projections to determine how much fuel to load for multi-year space missions, where running out isn't just inconvenient—it's mission-ending.
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