FIR

See also: fir, fir-, and fír

English

Adjective

FIR (not comparable)

1. (signal processing, of a filter) Initialism of finite impulse response; that has impulse response (or response to any finite length input) of finite duration.

Noun

FIR (countable and uncountable, plural FIRs)

1. (aviation) Initialism of flight information region; a specified region of airspace in which a flight information service (FIS) and an alerting service (ALRS) are provided
2. Initialism of first information report.
3. (uncountable) Abbreviation of far infrared or far infrared radiation.

Related terms

flight information region

• FIS

 

infrared

• FUV (far-UV)
• IR
• LWIR
• MIR
• MWIR
• NIR
• SWIR
• VLWIR
• VSWIR

 

Anagrams

• Fri, IFR, IRF, RFI, RIF, Rif, rif