| 释义 |
▪ I. requisite, a. and n.|ˈrɛkwɪzɪt|
Also 5–6 requysite, -yte, (6 -ytt), requisyte, (5 -ques-), 6–7 requisit, etc.
[ad. L. requīsīt-us, pa. pple. of requīrĕre to require.]
A. adj.
a. Required by circumstances or the nature of things, necessary, indispensable.
1472–3Rolls of Parlt. VI. 38/2 Asmany and such Writtes..as to hir shal be requisite in that partie. 1522More De quat. Noviss. Wks. 102 There are ye wote well two poyntes requisite vnto saluacion. 1592Kyd Sp. Trag. iii. xii. 97 If he be thus helplessly distract, Tis requisite his office be resignde. 1611Shakes. Wint. T. iv. iv. 687 A good Nose is requisite also, to smell out worke for th'other Sences. 1659Thorndike Wks. (1846) II. 504 Supposing the belief of Christianity to be a condition requisite to the having of God's Spirit. 1761Hume Hist. Eng. III. l. 97 Martial law, so requisite to the support of discipline, was exercised upon the soldiers. 1836Kingsley Lett. (1878) I. 36 One is expected to have obtained all requisite classical knowledge at school. 1878Jevons Prim. Pol. Econ. 28 We can hardly say that capital is as requisite to production as land and labour.
b. requisite variety, the variety necessary in a system for it to be able to control another system in which there is variety.
1956W. R. Ashby Introd. Cybernetics xi. 207 This is the law of Requisite Variety. To put it more picturesquely: only variety in R can force down the variety due to D; only variety can destroy variety. 1966S. Beer Decision & Control xii. 281 But however many interacting sub-systems of preys and predators, big fleas and little fleas, are invoked, it is none the less evident that the balance of animal populations would be grossly upset very rapidly unless the law of requisite variety held in general throughout nature. 1975R. M. Glorioso Engin. Cybernetics v. 72 As a minimum requirement, the number of different possible states of the system must equal the number of possible states of the environment, although the proper states of the system must be available as well. Thus, to reduce the variety in the environment, the system must be capable of achieving the ‘requisite variety’.
B. n. That which is required or necessary; something indispensable.
1602Archpriest Controv. (Camden) II. 224 They doe whollye reste for meate, drinke, and other requisits to lyfe, upon the providence of God. 1665Glanvill Def. Van. Dogm. p. viii, You think it more suitable to the requisites of the present Age, to depress Scepticism. 1750Johnson Rambler No. 71 ⁋5 Till all the requisites which imagination can suggest are gathered together. 1810Crabbe Borough xxiii. 76 Alas! he wants the requisites to rise, The true connexion, the availing ties. 1880C. R. Markham Peruv. Bark 315 The form of febrifuge which combines..the two requisites of efficacy and economy.
▪ II. † requisite, v. Obs. rare—1.
[f. as prec.]
trans. To request or require.
c1450Godstow Reg. i. 147 Paying there-of ȝerly to hym & to his eyeris or to his assynys oon rose..whenne þey been conueniently requisityd or Axid. |