(historical) Of or relating to Antoinette Bourignon (1616-80), a religious visionary who believed religion should consist of inward emotion rather than knowledge or practice.

(linguistics) A syllable that has no coda after its nucleus, and which hence ends in a vowel.

(electronics) Initialism of phase-frequency detector. / Personal flotation device. / Initialism of primary flight display. / Initialism of process flow diagram. / Initialism of photon flux density.

plural of equifertile