1866 C. Tomlinson Cycl. Useful Arts (new ed.) III. 14/1 The mouth of the solution jar was again closed.

1877 R. W. Raymond Statistics Mines & Mining 393 The liquid which runs out of the solution-tubs runs into tanks.

1894 Pop. Sci. Monthly June 281 In lime-stone countries, solution lakes are not uncommon.

1931 Jrnl. Geol. (Chicago) 39 641 (heading) Solution depressions in sandy sediments of the coastal plain in South Carolina.

1934 C. R. Longwell et al. Outl. Physical Geol. iv. 73 In some regions sinks, caverns, and solution valleys are so numerous that they give rise to a peculiar and characteristic topography with many surface depressions, irregular drainage patterns, and disappearing streams.

1939 A. K. Lobeck Geomorphol. iv. 145 Very large sinks or areas of depression are known as solution basins.

1954 Geol. Mag. 91 225 A lowering of surface by solution subsidence has been proceeding more or less continuously since Triassic times on this high moorland terrain.

1957 E. E. Evans Irish Folk Ways ii. 18 The lowland of which it is the centre is..diversified by occasional low hills, by intricate solution lakes and by glacial eskers.

1977 Antiquaries Jrnl. 57 189 Three large masses..recovered from red clay-with-flints filling a solution pipe at Aston Rowant (Oxon.).

1935 G. E. Doan Princ. Physical Metall. vi. 192 This heating and quenching is called the ‘solution heat treatment’.

1979 J. Neely Pract. Metall. & Materials of Industry xiv. 187/2 Successful heat treatment depends on putting the copper into solid solution and trapping it there.

1959 C. B. Allendoerfer & C. O. Oakley Fund. Math. vi. 102 Given a universal set X and an equation F(x) = G(x) involving x, the set {x|F(x) = G(x)} is called the solution set of the given equation.

1963 Webber & Brown Basic Concepts Math. viii. 166 The truth set of an equation is often called the solution set, and members of the solution set are called solutions of the equation.

1972 A. G. Howson Handbk. Terms Algebra & Anal. i. 5 Those objects of a given set which satisfy an open statement form the solution set of the statement relative to that set. Thus the solution set of x² = 2 relative to the real numbers is the set {+√2, −√2}. Relative to the rational numbers.., the solution set of x² = 2 is empty.

1940 J. D. Jevons Metall. Deep Drawing xv. 577 Rolled sheet could be ‘solution-treated’ to place it in a ductile condition.

1977 R. B. Ross Handbk. Metal Treatm. 207 Components which have been correctly Solution treated and aged are very often joined by [welding].

1952 Jrnl. Royal Aeronaut. Soc. 56 235/1 With highly tapered spar booms it is advisable to machine in the solution-treated condition in order that any correction..may be made before precipitation.

1931 Metallurgist 7 12/2 The age hardening..of duralumin and a number of other alloys of similar type requires a previous heat treatment, which is frequently termed the ‘solution’ treatment.

1970 P. C. Varley Technol. of Aluminium & its Alloys v. 62 All solution treatment is carried out in forced air circulation furnaces.

1903 Nature 3 Dec. 103/2 The persistence of the solutional nucleus.

1891 Pall Mall Gaz. 15 Oct. 1/3 A further improvement..will dispense with the need for solutioning the canvas.

1897 Earl of Suffolk et al. Encycl. Sport I. 281/2 They should preferably not be vulcanised but merely solutioned together.

1898 G. L. Hillier Cycling for Everybody 84 The internal hole should be closed by a patch carefully solutioned to the internal rubber walls.

1909 ‘R. Andom’ On Tour with Troddles 263 I ripped off the [tyre] cover, and found the patch hadn't quite caught, so we solutioned it down firmly.