selectivityn.

Brit.

/sᵻˌlɛkˈtɪvᵻti/,

/ˌsɪlɛkˈtɪvᵻti/,

/ˌsiːlɛkˈtɪvᵻti/,

/ˌsɛlɛkˈtɪvᵻti/, U.S.

/səˌlɛkˈtɪvᵻdi/

Etymology: < selective adj. + -ity suffix.

1. Radio. The ability of a receiver to tune separately to signals of adjacent frequencies, measured by the frequency difference between the half-power points of the pass-band of the receiver.

ΘΚΠ

society > communication > telecommunication > radio communications > radio equipment > [noun] > radio set > receiver > qualities of

selectivity1903

sensitivity1918

1903 Electr. World & Engineer 1 Aug. 173/2 The system of selectivity devised by Sir Oliver [Lodge] was the outcome of a series of classical experiments based upon his syntonic Leyden jars in which one jar is caused to discharge through a circuit by the sparks of another jar, provided the two circuits are of equal electrical dimensions.

1921 Discovery Apr. 93/2 For a warship very selective apparatus is an absolute essential..but in the merchant service great selectivity may often be a distinct disadvantage.

1925 P. J. Risdon Crystal Receivers & Circuits 22 Fair selectivity can be obtained with such an arrangement of vario-coupler as that indicated.

1930 Manch. Guardian 20 Sept. 15/7 It is no exaggeration to say that..four-valve sets are more than equal in power and selectivity to a six or seven-valve set of the old type.

1943 C. L. Boltz Basic Radio viii. 131 The sharper is the resonance curve the better it will select, for supplies at frequencies quite near the resonant one will have very much less effect. The sharpness of the curve is therefore a measure of the selectivity.

1976 Which? Sept. 203/2 If you want to receive particularly weak signals, you need a set which has good selectivity.

2. gen. The quality of being selective.

ΘΚΠ

the mind > will > free will > choice or choosing > types of choice > [noun] > selecting from a number or for a purpose > quality of being selective

selectivenessa1861

selectivity1948

1948 E. G. Boring et al. Found. Psychol. x. 218/1 This selectivity of perception amounts to giving one sense impression a clear track.

1951 J. Ruesch & G. Bateson Communication iii. 84 An alternate solution of the psychiatrist is to abstract and condense his observations before writing them down; selectivity, therefore, becomes an unavoidable issue.

1969 Computers & Humanities 3 278 The main program was the Formatting Program in which the two files were used as input to produce six indexes, four of which were selective. A ‘selectivity module’ had been introduced to make the selections possible.

a1974 R. Crossman Diaries (1976) II. 471 We were able to discuss one of the minor sensations of the recess—Ray Gunter's speech in August, in which he said we must be realistic and brave and face up to the need for selectivity and the means test.

1978 G. Underwood Strategies of Information Processing vii. 235 To information processing theory..attention and selectivity are central features.

This entry has not yet been fully updated (first published 1986; most recently modified version published online March 2022).

单词	selectivity
释义	selectivityn. Brit. /sᵻˌlɛkˈtɪvᵻti/, /ˌsɪlɛkˈtɪvᵻti/, /ˌsiːlɛkˈtɪvᵻti/, /ˌsɛlɛkˈtɪvᵻti/, U.S. /səˌlɛkˈtɪvᵻdi/ Etymology: < selective adj. + -ity suffix. 1. Radio. The ability of a receiver to tune separately to signals of adjacent frequencies, measured by the frequency difference between the half-power points of the pass-band of the receiver. ΘΚΠ society > communication > telecommunication > radio communications > radio equipment > [noun] > radio set > receiver > qualities of selectivity1903 sensitivity1918 1903 Electr. World & Engineer 1 Aug. 173/2 The system of selectivity devised by Sir Oliver [Lodge] was the outcome of a series of classical experiments based upon his syntonic Leyden jars in which one jar is caused to discharge through a circuit by the sparks of another jar, provided the two circuits are of equal electrical dimensions. 1921 Discovery Apr. 93/2 For a warship very selective apparatus is an absolute essential..but in the merchant service great selectivity may often be a distinct disadvantage. 1925 P. J. Risdon Crystal Receivers & Circuits 22 Fair selectivity can be obtained with such an arrangement of vario-coupler as that indicated. 1930 Manch. Guardian 20 Sept. 15/7 It is no exaggeration to say that..four-valve sets are more than equal in power and selectivity to a six or seven-valve set of the old type. 1943 C. L. Boltz Basic Radio viii. 131 The sharper is the resonance curve the better it will select, for supplies at frequencies quite near the resonant one will have very much less effect. The sharpness of the curve is therefore a measure of the selectivity. 1976 Which? Sept. 203/2 If you want to receive particularly weak signals, you need a set which has good selectivity. 2. gen. The quality of being selective. ΘΚΠ the mind > will > free will > choice or choosing > types of choice > [noun] > selecting from a number or for a purpose > quality of being selective selectivenessa1861 selectivity1948 1948 E. G. Boring et al. Found. Psychol. x. 218/1 This selectivity of perception amounts to giving one sense impression a clear track. 1951 J. Ruesch & G. Bateson Communication iii. 84 An alternate solution of the psychiatrist is to abstract and condense his observations before writing them down; selectivity, therefore, becomes an unavoidable issue. 1969 Computers & Humanities 3 278 The main program was the Formatting Program in which the two files were used as input to produce six indexes, four of which were selective. A ‘selectivity module’ had been introduced to make the selections possible. a1974 R. Crossman Diaries (1976) II. 471 We were able to discuss one of the minor sensations of the recess—Ray Gunter's speech in August, in which he said we must be realistic and brave and face up to the need for selectivity and the means test. 1978 G. Underwood Strategies of Information Processing vii. 235 To information processing theory..attention and selectivity are central features. This entry has not yet been fully updated (first published 1986; most recently modified version published online March 2022). < n.1903
随便看	to speak, think, etc ill to speculate to accumulate to speech to speel the drum to speer one's price to speer price to spell able to spell backward to spell baker to spell down to spell one backward to spell out to spell someone down to spellshort to spend a penny to spend and be spent to spend long to spend money like water to spend one's mouth to spend the mouth to spend the tongue to spend upon the stock to spew one's ring to spike a fever to spike a temperature