summationaladj.

Brit.

/sʌˈmeɪʃən(ə)l/,

/səˈmeɪʃn̩(ə)l/,

/səˈmeɪʃən(ə)l/, U.S.

/səˈmeɪʃənəl/

Origin: Formed within English, by derivation. Etymons: summation n.², -al suffix¹.

Etymology: < summation n.² + -al suffix¹.In summational tone (see sense 1) after German Summationston (see summation tone n. at summation n.² Compounds 2).

1. Acoustics and Music. Designating a resultant tone sometimes perceived when two other tones of different pitch are sounded together with sufficient intensity, its frequency being equal to the sum of those of the tones being sounded. Cf. sum tone n. at sum n.¹ Compounds. Now rare.

ΚΠ

1873 A. J. Ellis in E. Atkinson et al. tr. H. L. F. von Helmholtz Pop. Lect. Sci. Subj. iii. 102 (note) These [combinational tones] are of two kinds, differential and summational, according as their pitch is the difference or sum of the pitches of the two generating tones.

1875 Monthly Musical Rec. Dec. 164/2 The second class of summational tones..were discovered by Helmoltz.

1936 Musical Q. 22 229 Every interval carries with it its satellites, which consist of the differential tones and a summational tone.

2. Of or relating to a sum of numbers or quantities. Sometimes also: increasing or increased in effect or force by successive additions; cumulative. Somewhat rare.

ΚΠ

1939 U.S. Patent 2,171,215 1/1 A ‘summational’ characteristic for both devices is obtained by adding, for the same potential, the corresponding currents.

2010 European Jrnl. Mech. B. 29 153 We have obtained such expressions in summational form that are conducive to use in high-order viscosity coefficient computations.

This entry has been updated (OED Third Edition, September 2019; most recently modified version published online March 2022).

单词	summational
释义	summationaladj. Brit. /sʌˈmeɪʃən(ə)l/, /səˈmeɪʃn̩(ə)l/, /səˈmeɪʃən(ə)l/, U.S. /səˈmeɪʃənəl/ Origin: Formed within English, by derivation. Etymons: summation n.², -al suffix¹. Etymology: < summation n.² + -al suffix¹.In summational tone (see sense 1) after German Summationston (see summation tone n. at summation n.² Compounds 2). 1. Acoustics and Music. Designating a resultant tone sometimes perceived when two other tones of different pitch are sounded together with sufficient intensity, its frequency being equal to the sum of those of the tones being sounded. Cf. sum tone n. at sum n.¹ Compounds. Now rare. ΚΠ 1873 A. J. Ellis in E. Atkinson et al. tr. H. L. F. von Helmholtz Pop. Lect. Sci. Subj. iii. 102 (note) These [combinational tones] are of two kinds, differential and summational, according as their pitch is the difference or sum of the pitches of the two generating tones. 1875 Monthly Musical Rec. Dec. 164/2 The second class of summational tones..were discovered by Helmoltz. 1936 Musical Q. 22 229 Every interval carries with it its satellites, which consist of the differential tones and a summational tone. 2. Of or relating to a sum of numbers or quantities. Sometimes also: increasing or increased in effect or force by successive additions; cumulative. Somewhat rare. ΚΠ 1939 U.S. Patent 2,171,215 1/1 A ‘summational’ characteristic for both devices is obtained by adding, for the same potential, the corresponding currents. 2010 European Jrnl. Mech. B. 29 153 We have obtained such expressions in summational form that are conducive to use in high-order viscosity coefficient computations. This entry has been updated (OED Third Edition, September 2019; most recently modified version published online March 2022). < adj.1873
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