Polychoric

The polychoric motets of the Venetian school (Willaert, the Gabrielis, etc., some of whose motets are found in CW vol. 10 and IM vols. 1-2) furnish striking possibilities for multiple brass choirs.

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The brilliant polychoric canzona has contrasting sections of imitation and homophony; this evolved into the Baroque sonata.

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Here, a spatial polychoric effect is attained in an acoustical polarity between the deaconesses and missionaries in the "hallelujah corner" and the deacons in the "amen corner," or in churches where the seating arrangement is segregated by gender.

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2007, Bruno D. Zumbo, 3: Validity: Foundation Issues and Statistical Methodology, C. R. Rao, S. Sinharay (editors), Handbook of Statistics, Volume 26: Psychometrics, page 66, Because the CES-D items are ordinal in nature (i.e., in our case a four-point response scale, and hence not continuous), a polychoric covariance matrix was used as input for the analyses.

Source: wiktionary