vanishingly


van·ish

V0023000 (văn′ĭsh)intr.v. van·ished, van·ish·ing, van·ish·es 1. a. To pass out of sight, especially quickly; disappear. See Synonyms at disappear.b. To pass out of existence: when the dinosaurs vanished from the earth.2. Mathematics To become zero. Used of a function or variable.
[Middle English vanisshen, alteration of Old French esvanir, esvaniss-, from Vulgar Latin *exvanīre, alteration of Latin ēvānēscere : ē-, ex-, ex- + vānēscere, to vanish (from vānus, empty; see euə- in Indo-European roots).]
van′ish·er n.van′ish·ing·ly adv.van′ish·ment n.
Thesaurus
Adv.1.vanishingly - so as to disappear or approach zero; "errors are vanishingly rare"