[ad. L. ēductiōn-em, noun of action f. ēdūcĕre to lead forth.]
† 1. a. A leading forth or out. b. A putting forth (of the tongue). Obs.
1649. Bulwer, Pathomyot., II. x. 233. This ironicall eduction of the Tongue.
1654. Trapp, Comm. Job i. 13. Israel’s eduction out of Egypt.
1659. T. Wall, Char. Enemies Ch., 19. God ascribes their eduction from Ægypt also unto Moses.
† 2. Med. Removal by drawing forth. Obs.
1657. Tomlinson, Renou’s Disp., 139. We need not suspect any harme by the eduction of some of them.
1684. trans. Bonet’s Merc. Compit., XIV. 493/2. The eduction of the Matter is hindred.
1710. T. Fuller, Pharm. Extemp., 180. The true cure … consists in the … Eduction of … Phlegm.
3. The action of drawing forth, eliciting or developing from a state of latent, rudimentary or potential existence; the action of educing (principles, results of calculation) from the data. Also concr. = EDUCT.
1655. D. Capel, Tentation, 78. But the work [of sin] must begin at the inward eductions and motions of the will.
1677. Hale, Prim. Orig. Man., IV. ii. 295. This eduction and circulation of the Light should begin and be continued at least for the first three Days of the World.
1678. Phil. Trans., XII. 938. The most ancient Atheistick Hypothesis was the Eduction of all things, Life and Understanding it self, out of Matter.
1686. Goad, Celest. Bodies, I. ix. 35. The Power of Matter, and Eduction therefrom, are meer Words.
c. 1840. Sir W. Hamilton, Logic, App. (1866), II. 257. The logicians have … limited reasoning … to a mediate eduction of one proposition out of the correlation of two others.
1865. Masson, Rec. Brit. Philos., 70. [Sensible objects] are not the actual existences out of us, but only … eductions by our physiology out of a ‘something.’
4. The bringing on or occasioning (an event). Cf. EDUCE v. 4. rare.
a. 1806. K. White, Rem. (1811), II. 280. We see … men sedulously employed in the eduction of their own ruin.
5. Steam-engine. a. The exit of waste steam from the cylinder either to the condenser or into the atmosphere; chiefly attrib., as in eduction-pipe, -side, -steam, -valve; but now almost entirely superseded by EXHAUST. b. Short for eduction-valve.
1782. Watt, Specif. of Patent, No. 1321. The steam rushes into the eduction-pipe.
1829. ‘R. Stuart,’ Anecd. Steam-Engines, II. 374. g. g., Exhausting or eduction valves.
1835. Sir J. Ross, N.-W. Pass., ii. 14. Having led the steam from the eduction pipe.
1839. R. S. Robinson, Naut. Steam Eng., 102. The steam will be cut off … but the eduction will remain open.
1841. Scott Russell, Steam, 281. The eduction valves, ports, and passages by which the steam enters the condenser should be much larger.
1859. W. Rankine, Steam Eng. (1861), 486. An eduction valve … to let the steam escape to the condenser.
