FIR
(aviation) ; a specified region of airspace in which a flight information service (FIS) and an alerting service (ALRS) are provided.
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(aviation) ; a specified region of airspace in which a flight information service (FIS) and an alerting service (ALRS) are provided.
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(signal processing, of a filter) ; that has impulse response (or response to any finite length input) of finite duration.
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