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Reference meaning

pf.

noun·Reference

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Abbreviation of perfect.

Other meanings

2. noun

Abbreviation of perfective aspect.

3. noun

Initialism of pilot flying, a pilot currently in control of the flight trajectory of the aircraft, as opposed to pilot monitoring.

4. noun

Initialism of peak flow.

Source and scope

This definition is reproduced from English Wiktionary, sense en-pf.-en-noun-AtJ3VQvx, under the CC BY-SA 4.0. It has not yet received VocabularyBase editorial review. Read the source and license details.