an instant; a very short space of time.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for eyeblink
It was an eyeblink ago that that divorcées were shunned, that contraception within marriage was often considered reprehensible.
Lo, levin leaping lightens in eyeblink Ireland's westward welkin.Ulysses|James Joyce