Obs. rare. [ad. L. type *collustrātiōn-em, n. of action f. collustrāre to brighten, f. col- + lustrāre to purify, make bright.] lit. A shining together, conjoint illumination.
1603. Holland, Plutarch’s Mor., 1169. A certaine collustration, and mutuall conjunction of lights, as torches which being set a burning together, do augment the light.
b. fig. Collateral illustration.
1864. Lewes, Aristotle, 20. When a writer’s composition is good there is less need of illustration or (to use a favourite word with the Florentine Platonists) collustration.
